You shouldn't make rude jokes.
Brian is at an office party and wants to break the ice with some employees he doesn't know too well.
Brian wants to use humor.
Brian makes a harmless, funny pun about cats.
Brian tells what he thinks is a zinger about blonde women.
The employees think Brian's joke is cute, and they all like being around him.
The employees are offended because some of them happen to be blonde and keep distance from Brian.