11 years old is 6 years under the recommended age of 17 to play/purchase the game. I would say before you complain don't let kids play a game made for teenagers or older. This problem is not a problem of "rude" players, it's bad parenting. It's your fault and your parents to let your brother play a game that is above his maturity level and has players that will use language intended for older players, not kids. Edit: as pointed out the game is rated T not M as I had thought, but said player is still under recommended age to play.