Dad is getting into MGTOW videos- advice?

My dad has always had a slightly chauvinistic side that has just progressively gotten worse as he's aged. (Incidentally, he has not had a gf in over 2 decades. 🤔) He has high standards for himself and surprisingly sometimes exhibits some HV behavior (he thinks it's ridiculous how slobby millennial men actually manage to get women when they refuse to take care of themselves for example) but I cannot excuse his sexism.

As of late he's told me he's been watching their videos and agrees on some of it. Not that he thinks incels are okay, but he seems to believe those are a fringe group instead of closer to eat MGTOWs overall are. It's baffling because he used to never have a problem dating when I was a kid, he's educated and I know he's not bad looking for his age, he can be fun, generous, caring, and charming to women. So I don't understand where this bitterness comes from AT ALL, but he also sometimes shows a very hypocritical dislike of single moms considering he was a single dad.

He tried getting me to watch a video and I refused. I know already what MGTOWs spew and I don't need their negativity anyway. Unfortunately I cannot cut my dad off entirely; I can't give details but I do rely on him for help in my life now. And it's sad to think of cutting him out because we're quite close and he can be a very good parent and in general person to talk to when dating isn't the topic.

Any advice on how to handle this if he brings it up again?