I second the comment 100%. It's dangerous AND stressful to the parrot. Geez, for all we know, the guy could have touched your bird with hands covered in pathogens from his birds (they don't vet or even quarantine in the greatest majority of cases and they never test for contagious disease -not cost effective). And all it takes is stress (which you are already providing with the outing) and a pathogen deposited on the plumage which will eventually end up in his system through preening (and yes, even on the head because they scratch their head with their feet and then groom their feet with their beak thereby swallowing the pathogen). And before you say to yourself that a petstore could not have sick birds, I know of two that were quarantined because one was selling babies with polyoma and another with psittacosis (they did not know it but they were buying babies that came sick from the breeding establishment) - even Petco had to stop selling birds for a while because theirs were all sick about a year or so ago.
Could you post a picture of the poop? Because, sometimes, people think that their poop is watery when, in reality, it isn't (normally, bird poop is more than 75% water).





