This a typical example of somebody having a parrot and not understanding the first thing about them. The parrot is showing displaced aggression with the bottle (not a good thing to begin with and something a well-adjusted parrot would not have) and the owner makes it 100 times worse by his actions and his tone of voice. Whenever a parrot has any sort of aggression issue, it is ALWAYS the human's fault.
https://uk.news.yahoo.com/parrot-tries- ... 53111.html