Yeah, I've seen that at work when peeps are playing SFIV tourney mode. They just bail; every culture has its weak sauce component. And the internet is full of shits that do stuff anonymously that they'd never get away with in person.
Actually I just remembered a really frustrating UNO game, if you can believe that, where two players were just having a conversation, and ignoring their turns. UNO's got a good game design for handling that, but the first few rounds of an "absent" player are still patience-trying, particularly if they're THERE and just CHATTING with each other. They finally left the game, but I thought that was pretty rood.
On the other hand, I was playing UFC the other day and some US-accent jerkoff was talking about raping me and calling out every single racial epithet I've heard and a few more besides. He was good at the game, but the lousiest, rage-inducing freak I've ever heard. He was playing a lvl. 98 character against my level 8 one (just experience level, not a relative power thing), so I asked, "Really? You just mopped the floor with a noob player, and you're that excited about it? Was it that much of a challenge for you?" So I guess the UNO guys were not that bad.