Meh, no one got really harmed. If you are outraged don't listen to his program anymore, and get your friends not to, maybe write a complaint to the station, should solve the problem.
Though personally I find those publi crucifixions of "public figures" for slightly offensive comments distasteful. Cause you know, mobs destroying people's life, by getting them fired and perpetuating that they are horrible racists (for example) is, to me at least, much worse than a racist joke, no matter how distasteful.