Nobody on this forum engages in or condones any form of aggressive personal abuse and most have said as much on several occasions. Justified criticism and a response in kind to the abuse Wenger is certainly not above dishing out in the direction of the fans is entirely justifiable. And it's an ever growing matter of dispute as to whether he's a decent man, by the way. I'm starting to thing devious would be a far better description. But each will have their own opinion on that.
As for the hat, Graham's, Wenger's and Bergkamp's.