Posted by: Sanuel Jackson
They're usually people who play a lot of MLG. In that playlist, the enemy team isn't automatically muted because it's still considered social, so everyone just mutes the other team in the pre-game lobby.
There is also the chance that they're really annoying as well, but that doesn't happen very often (unless they're blasting music or something).
I don't know, I never go in game chat because I'm always in a party with my friends.
[Edited on 01.15.2012 8:54 PM PST]