We 360 gamers kind of have a reputation for it, and, by damn, it's deserved.
I've met some horrific trolls on PS3, but no really angry people, and while PC gamers might have a superiority complex, they're generally pretty chill.
I don't think I've ever met an angry handhel - oh, there was the onetime one kid at school flushed another's PSP down the toilet, and they had a bitchfight, but that was more entertaining than anything.