That will achieve nothing but getting them to dislike you. That is an option, but I think two better ones are to either accept that you’re not going to change their minds because they’re too far down that rabbit hole and either just cope or cut off contact or spend a lot of time and effort constructing rational counter-arguments. I recommend the former.

I have some very crazy friends. That’s okay because they’re crazy in ways that don’t offend me. If they offend me with their crazy, I’m not going to waste my time with them anymore. It’s not worth the effort to try to change them and it isn’t really my job.