He dislikes fighting so much that he sometimes foregoes problem-solving altogether.

Calling him names won't work because he's mostly chill or pacifist. No appeals to his pride seem to work.

He does get angry sometimes, but manifests it in indirect ways, like he's repressing it. He gets sad and drinks.

When he's drunk he shows anger, but it is difficult to talk reason to him them.

Just typed us both, hes an ESFP and Im an INTP

Does this cause any problems for you?

You can't make people who don't care care.