It sounds like the problem is not how he plays; that is just a symptom. The problems are:
he does not care about the enjoyment of others in the group
He does not care about the enjoyment of others in the group.he does not take criticism like a an adult.
So that is what you should be talking with him about. He is not being self-aware either intentionally or accidentally.
He does not take criticism like an adult.
So that is what you should be talking to him about. He is not being self-aware, whether intentionally or not.
Asking him if he would tolerate a player doing what he does is a good lead in. Ask him that when he has some time to actually think about it.
Having other players, and not just you as a GM, speak to him will help too. He may not realize this is how everyone sees him; he may see it as a one-on-one confrontation.
There isHere's a wonderful video about this specific problem:quote from Matt Colville's Matt Colville's TheThe Wangrod Defense, Running the Game #76.
And there is a great part of it. When he says "I'm just playing my character", the answer is, "We are all just playing our character, but you're the only one making other people unhappy."a wonderful video about this specific problem:
... But however you do it, at the end of the day, if a toxic player tries to defend themselves by saying "I'm just playing my character", a simple response is "We are all just playing our characters, but you're the only one making other people unhappy."
D&D is group storytelling, not a single-player video game where your actions don't affect anyone else.
But if his fun is ruining other peoplespeople's fun, and continues to, then you may have to un-invite him and tell him why. Tell him: "It's not just about you." If his behavior ruins other peoplespeople's fun and he doesn't care, that's probably going to start bleeding into other interactions anyway.