-Spawn Campers. I don't mind regular campers (unless they're the kind who never shut up), but there is no "legit" way to spawn camp. That's just being an asshole.
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-People who seem to jerk off to how high their KDR is. The kind who go on places with objectives because it makes camping extremely easy, thus a high KDR. They then procede to brag about how they are so awesome at life, and how you all are Motherfucking-Jew-Ni**er-Fags-(insert slur here) who need to go hang themselves because you had the same number of deaths as you did kills. If you want to brag about your high KDR, GO ON TEAM DEATHMATCH! Even when they lose, they say "Well, these scrubs still don't have as high a KDR as me" I even once asked one of these asshats "Why not stay on Deathmatch?" the response I got was "It's easier to get a higher KD on Demolition, Sabotage and Domination."
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-Hackers. Do I really need to explain this one?
-Mic Spammers. If there is no mute option, these guys are #1 on my most hated FPS player. And I don't mean the ones who play funny clips at certain time, or play songs AFTER the match is done. I mean to people who SING BADLY ALONG TO MUSIC I CAN'T STAND THE ENTIRE MATCH, ON LOOP! These people need to have their mics explode in their ears.
-(For BC2) People who take the driver's seat of a vehicle, and don't move. Or even worse, they ***** ad moan until they can get into the driver's seat, and drive the tank I spent so much time repairing from 1 to 100 health into the water.
-I respect campers and their tactic, but that doesn't mean I don't HATE them with every fiber of my being. Not snipers, because that's honestly the right way to snipe. I mean guys who wait in corners or windows and shoot once they see someone, and have mines protecting all means of getting to them.
-I don't mind 12-year-olds, as surprising as it is. As long as they keep quite. Maybe offer helpful advice. Once they start the trash talk, however... I'm not good with kids IRL. I'm angrier online when playing shooters. Simple math, really. I make it a personal goal to always be on the opposing team of that kid and hunt him down until he ragequits. Petty? Hell yeah, it is, but it's just so damn awesome.