Do whatever you can live with. That said, you have other options besides all or nothing. You can tell him that it’s taxing to be around him and ask for specific behavioral changes you’d like to see to make things more tolerable. Whether or not he agrees to them is up to him, but you’re at least trying for a workable relationship.

I emphasize behavioral change because he can’t just flip a switch on his beliefs. No one can. Our beliefs are a conclusion based a number of factors including our experiences, the information we are exposed to, our emotions, etc. He couldn’t switch his off and on any more than you could.

If you really want to affect his beliefs he will have to feel like you hear and understand them first. Be curious without expressing judgement. If he feels heard he might be more open to reciprocating that feeling and hear you out.

But you’re not obligated to do that. If you can’t take it then be honest with yourself and take care of you. Just don’t get stuck in black and white thinking