Are you referring to this:
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It is very deserved.
"GCC's are like cockatoos." That's a new one.
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And this doesn't really say anything of any value except give your personal opinion as a statement of fact. Now, your opinion could very well be a well-informed one but although you had a GCC in the past, I don't know where it is now, if you had only the one, how long you've had it, its gender or what your husbandry was, in detail (I did notice that you fed it pellets and that you caressed its back on a video you provided but that's about all I could tell). You then mention getting a baby sun conure but now you have a Sunday on your profile so...
And yes, GCCs are VERY much like cockatoos in that they need hours and hours and hours of one-on-one - they are both very needy species and, as such, very hard to keep happy in captivity. They just manifest their unhappiness in different ways... When cockatoos are unhappy, they pluck, scream like maniacs and even self-mutilate (I have two right now but had a total of five altogether) while, when GCCs are unhappy, they become aggressive and some of them also become screamers (two of the four I took in were biters and screamers, the other two were just biters).