There's this guy I don't want to be friends with because he's just so bad a the game.
Why do you think he's so bad?
I've noticed he doesn't try hard enough, so I told him he should change
It's bad to exclude your friend because of a game. You should try other games that they are good at.
Nah he should bother to improve so that he can play with us.
Leaving your friend out is mean and you are probably hurting his feelings. The game is for fun, aren't you worried about how excluding him could harm your relationship?