Complaining about what other people put in their DND game is a position of weakness. You cant win like that. You can make fun of it as a disaffected third party, but you cant expect to persuade it away, so dont get invested and dont spend emotional effort on it. Dont bother with logic either. Just say they look retarded or something.

Then put sexy women and improbable violence and whatever you want in your DND game, and laugh at them when they tell you to change it. That's the position of strength.