This isn't really an aibu as such but could still apply. Basically I have a friend I've known quite a while now, she's a good person and very kind. I am in a running group that her husband goes to. I've gotten to know him and to say he is misogynistic and awful would be an understatement. He is constantly flirting with another woman years younger than him and pestering her to have an affair with him and he will go on with all the usual rubbish like his wife "doesn't understand him".
The things he says about her kinda make my skin crawl, one of the latest being "It's not easy waking up next to a swamp donkey every morning".
It's difficult to know what to do. He knows I'm friends with his wife but still comes out with this kinda stuff, then all over Facebook he has gushing photos of both of them and everyone thinks they are an amazingly happy couple.
Would I be right to just stay out of things or should I tell her what he has been saying?