Like Kinex posted, swearing is fine. Just don't go calling every player who kills you a 'loving noob' or whatever. That rarely leads to anything worthwhile. Just grit your teeth, yell at your wall that that guy is a 'god damn nade spammer' or 'rocket loving noob' or whatever, and try and move on and enjoy the pointless killing of blocky figurines.
I like spicy food.