Yep - hangout in parrot FB groups long enough and you'll see this is very prevalent (14,000+ members in the African Grey group alone). Someone gets a beak on the skin (birds third foot) and they say "my bird bites". I'll stand by my comment, it's usually the idiot that owns the bird, not the bird being aggressive. I've seen a lot of birds and haven't seen very many of what I would consider truly aggressive.
I take Greycie to race outings and 9 out of 10 people she's able to buffalo just sensing their fear and she's far from 'aggressive'. They will tell me she's mean.