It sounds like he's picking a fight with a topic he knows you'll defend yourself against. He's trying to keep you engaged. You're busy trying to prove him wrong and he's really only interested that you are talking to him at all. This is a good chance to stop being his supply. You don't need to prove him wrong, you already know he is.

I have been in your shoes. You can can choose to be right OR happy. Choosing to be right and proving him wrong isn't going to bring happiness. After all, aren't you mostly just angry now? Choose happy and don't supply his ego. You'll feel better knowing you are stronger than his manipulative tactics.

You deserve to be happy.