Some kids just won't believe people are hurt and misunderstood the joke if they can't see the hurt. They just won't.. and then they grow into adults who just expect everyone to stop being 'oversensitive' when things get misunderstood and can potentially have a lot of social problems because of it.
How do you deal with those types of adults? Is there ever a chance of getting through? I have someone very close to me exactly like that...he can't handle emotions from other people (not even love) and his wife takes antianxiety meds to keep from being "emotional". He can't see when he has hurt someone or why someone would get upset when he doesn't know to STOP teasing or whatever. He doesn't seem to see the need to apologize. Life for me is much easier being an emotional person and letting it all hang out, than trying to deal with someone like that.