It’s not a bad thing to disagree/debate with someone, as long as you can both stay respectful and really listen to each other (not saying you wouldn’t, but I’ve found it hard! Lol!). If you feel hurt by some of his comments I think it’s worth talking about it. Your feelings matter and it could also improve the friendship.
I did ceramics/pottery classes as part of my college course. Still got a couple of my pieces, too! I kinda hated it, to be honest lol - how did you find it?