Should I tell my friend to stfu and stop sucking his own dick when playing a game?
That sounds a bit cruel. What would be the reason for wanting to hurt someone like that? Are you motivated by some kind of revenge?
His tendency to attack always irks me. Of course I don't want actual revenge, but I just feel like doing that
While it's understandable to get upset at others when playing a multiplayer game, it isn't appropriate to use rude and offensive language to let out that frustration. That is toxic behavior and can emotionally affect others negatively. If you want to play multiplayer games and still keep your friends, you should try to be calmer and more respectful when interacting with them in game.
It's gaming not real life you dumb ass!!
What you do and how you act in a game can also be translated into your real life sometimes. Don't you find that if you curse at people in a game, you often curse in real life too? That is why I just want to help you understand that maybe it's worth considering acting a bit more responsible and mature in the game.