Would this be a deal breaker for you in a potential relationship?

I have a good friend who’s married to this guy who has the most peculiar and annoying habit. He calls her names then, when she acts insulted, he says, ‘oh, I was just kidding.’
Last week I was on the phone with her and , in the background, I heard him say, “Aster is a heathen.” It’s a good thing I wasn’t there when he said it. I assume he smiled afterwards; I don’t know. But I think it’s unacceptable, stupid and rude.