Bee, don't blame yourself because the guy who seemed so nice in the beginning has either changed or is now showing his true colors. You had no way of knowing, and you wouldn't have put your daughter with such a man intentionally. Blame the person who has no right to do what he's doing.

You probably should take the advice to talk to your daughter in private, but I'd probably say something the moment he made the comment. He might say something about the size of your daughter's butt, and you could say, "It is? Oh, sorry, I couldn't see it, because your big butt was blocking hers." But I'm a smartmouth!