I think these inner feelings you’re getting about parrots seems to come across about fear, mostly. That’s what’s coming across, pointed to several times, in your post.
Maybe if you understood that parrots sense as well as react to emotions in people, and learned to understand their nature and behavior, your fear will go away about parrots; then this problem will be eliminated.
When they screech when “their person” goes out of the room, they are wanting to know that the person is ok. It is part of their loyalty, bonding, and loving behavior as “flock animals”.
Examples:
If there is an angry person in the house, like yelling a lot, etc., the parrot will not like that person, and will react accordingly (shy away from the person, or if the person comes near them to try to react with them physically (drawing a hand near them to touch or pet or play with them or try to get them on their arm), the parrot will react with the only protective behavior it knows how to, which is biting. Think of the parrot’s fear too.
They sense loving spirits: The first time I saw my parrot in the parrot shop, he came right to me, & jumped right up on my arm, when I put my arm out to it.
They sense and want to comfort sadness in humans: My parrot, as well as two of my friend’s parrots, when we were crying – these parrots came right to us, walked, flew, climbed up our bodies straight to our shoulders, then wiped their beaks on our cheeks wiping our tears away.
Just like a horse or a dog, parrots will sense fear in a person. I’m talking here about the kind of fear of the person being afraid of the animal. These different types of animals react in different ways, when they sense the person is afraid of them. A horse will take off running, with you on it. A dog will attack you. A parrot will react in different ways like shying away from you, biting, etc.
All parrot’s systems are extremely sensitive (nervous systems, emotional systems, lungs, bones, internal organs). They can die from a lot of stress and fear (nervous system). They can die from losing “their person” (the person they are “bonded” to – IF they are not adjusted correctly (emotional system). (Bones): People who are uneducated about parrots, at times break their delicate bones, just while handling them. They are simply unaware. ALL of their bones are delicate, in their wings, ribs, legs, feet, back, neck, mandel in the neck area, head, everywhere. (Lungs): Extremely sensitive, can die when breathed in many things. This is also because a parrot breathes a hundred times faster than humans do. Any cleaning chemical which has strong fumes can kill parrots. There can be NO SPRAYING of ANYTHING into the air when you have parrots. Lysol and frebreeze cannot be used AT ALL IN ANY WAY. Glad plug ins, any type of air fresheners, burning oils, potpourri, insence, even dry potpourri – all can not be used AT ALL IN ANY WAY. These things will all kill parrots and are also toxic to the parrots. And some of these fragrant things and fragrant oils, the manufacturers put chemicals into, in order to make the fragrances last longer. Result: Dead parrot. Candles and fireplaces cannot be used. There is a substance that comes off the fire from the fire place that kills parrots. (There was a lady who put her parrots next to the fire place, fire buring in it, in winter time. The next morning, she woke up to a dead parrot.) Even some candle wicks now days have lead in them, and once the parrot breathes this in – lead poisoning – dead parrot. Any cleaning chemicals have to be diluted to ¼ or 1/8 cup of the chemical to a gallon of water. And you can dip the cleaning rags into that solution and wipe things down, but NOT spray chemicals into the air. Similarly, you can spray OUTSIDE the chemicals onto a cleaning rag, then come inside and wipe things down with the rag.
The way to get a parrot acclimated to you is gently and gradually. Gentle and gradual are the keys. And a lot of patience. And you talk to them sweetly, and don’t push yourself on them, or push toward them, for example, when they’re backing away. They have to learn to trust you. Backing away and reaching toward to bite are signs that the parrots give people when they’re either not ready for you yet, or they are afraid of you, or even to their bonding person when they’re just in a mood where they don’t feel like being bothered and feel like just resting at the moment. But with their bonding person, they bite extremely gently, as like just a nudge, to let their person know; or they take their foot and push their bonding person’s hand away.
Don’t keep pushing toward them, going toward them, when they back away. Don’t push food toward them. Let them come to you and take the food or treat, with just holding it up and showing it to them, talking to them, about a foot away. If they start to come toward you to get the food then you can gradually move in closer to help them get the treat. If they back away, sit back down, going away from them with the food, and talk to them sweetly from where you’re sitting down. Let them study you and look at you. When you see a parrot’s head tilting, this is an indication that the parrot is listening to you, trying to understand you and what you may be saying or doing, and learning you. One of a parrot’s MAIN interaction keys is VOICE of the humans. This is also why you talk to them sweetly. And you have to keep doing this process, until eventually the parrot responds to you and interacts with you, instead of backing away signs (IE: comes toward you and takes the treat from your hand). When the parrot(s) lets you come toward him without backing away, or comes toward you for things, that’s how you know the parrot is beginning to get “acclimated” to you. From there as you then continue the process with different things, the parrot will grow to bond with you and interact more and more with you, to the point where the parrot will win your heart. Trust me.
Hitting a parrot will only make things worse between you and the parrot, and can detrimentally hurt the parrot. The parrot will become more afraid of you and will react more aggressive toward you. The parrot will not like you. And unlike a dog or cat when you spank them, the parrot will NEVER return to you. It will totally turn on you. And it will never give you a chance to become acclimated with it again. You would have totally ruined any chance of becoming friends with the parrot. This is also based on when training parrots, in wanting them not to do something which you don’t want them to do, you distract their attention to something else to get them away from it or to stop doing it. And you can use a firm voice at times too, and just shake your index finger, saying, “No! Bad Bird!” or “EEEHH EEEHH EEEHH” or “UUUHH UUUHH UUUHH” (like no-no-no). Like when I do this with my parrot, he knows the difference by voice, when he’s doing something I don’t want him to get into, and he stops doing it. Just like dogs and cats. At times they’ll then keep going back trying to do it. And each time you do the “EEEHH EEEHH EEEHH”, and they stop each time, then after 3 times, if they do it again, you put them back in the cage. Being consistant with this process eventually trains them not to be getting into that thing, that – that place is a no-no and/or off limits. Or distracting their attention toward something else, like give them a toy, play with them with a toy, give them a treat, etc. NOT EVER hitting or spanking them, or twitching their beak or anything. First of all, they do not learn by hitting. Second of all, they will totally turn on you with hitting. Third of all, you could seriously hurt them, even their beaks. Never hit their beaks. If you hit a bird, they will become angry with you also.
There are many easy ways to keep things clean after parrots on a routine basis. Nothing disgusting about them.
There is a lot you don’t understand. And there are many details that go along with all this, that would take too much time to type here. I would suggest you learn and study more about birds behavior and care. Go to a parrot shop and ask them if they have this book; it's a thin book, you can read it quickly, and you will find it interesting:

That is the only chance you will have to become sensitive to them and appreciate them. Please share my post with your girlfriend.
This is also a terrific book, for second hand owners, help with adjusting parrots to new owners, once they lose their person (their first owner who they were bonded to):
