Well there is likely little you can do about his lacks. Instead it’s better to figure out what about him that leads to your feeling low after you have a conversation with him.

It sounds like you are figuring it out by what you just shared. He probably thinks you enjoy listening to all the things he knows. Usually people prefer hearing what’s important to them and once they find someone who will listen they can go on and on.

Maybe he reminds you of another person that interacted with you that way and you actually get tired when you talk to him and that’s what makes you feel bad about yourself.

He is probably more of a black and white thinker?