well, there are bad mannered malaysian, singaporean, thais, indons etc. But i think probably pinoy is the easiest to recognize from their language and also due to their very common cyber cafe trash talking culture, therefore it seems like there's more pinoy troll/flamer/trash talker.

Anyway, the type of people i despise the most are those who type ez at the end of the game. It's so rude and you look super childish to me. We should have respect for the opponent since they spent equal time playing that game with you and you were the better team that game. If you really love playing snowball stomping game, why not go play ai and type ez when you get 52 kills at the end of the game? Might as well be more satisfying.

And one important thing is that don't think about your teammate's mistake that might cost you the game. If you have time to complain about team mate, you might as well take the time and think of how you can win the game instead of crying like a cry baby, complaining and afking at base.
Sure, you might lose if your team mate made alot of mistake, but when you give up on the game, then you are denying yourself the chance to win.