Sure, Howard Stern is a pompous and arrogant jerk, but that's not the main reason that I hate his show.
What ticks me off is that his show is one giant commercial. It seems that there is a 10 minute commercial break for every 20 minutes of on-air time, and both him and his guests are constantly plugging their products DURING the show. It seems that the only two reasons that people put up with being humilated with his stupid games and questions are that:
1) They are trying to promote something. Actors promote their movies and books, musicians pimp their latest album, the all the strippers and porn stars are whoring themselves out for extra publicity.
2) They want something from Howard. Either it's callers kissing Howard's butt for concert tickets, or slutty strippers begging for boob implants. He takes advantage of this, and makes these people stoop to the lowest common demoninator for some cheap entertainment.