Even though I didn't catch much of the final show, I did think of a way to explain the complex ironies of Howard's humor to those who can't see it through politically corrective glasses: When Howard seems to be making fun of Wendy the Retard , he's having fun with her; and when he seems to be having fun with Daniel Carver the racist , he's making fun of him.
I've never found Stern to be funny. Back when he was married, he was somewhat amusing in a 7th grade bathroom sort of way - mostly from the "his wife lets him do what?" kind of perspective. After the marriage ended, so did that question.
I can hear 7th grade level locker room humor anywhere though, and I don't feel a particular need to seek it out. Another thing - if you have to explain something as simple as what Doc tries to explain above - it's not, in fact, simple. I've watched Stern on TV, and I've listened to him on the radio. It's not at all clear that he's anything other than a misanthropic fool to me, and I don't think I'm particularly humor impaired, or a fan of PC notions. Stern is the classic shock jock, and his shtick has ratcheded up the shock meter over the years as people have gotten used to one shocking set of humor after another.
I've seen real comedians, and while they don't necessarily eschew cursing, they can be funny in almost any context without having to reach back to 7th grade. George Carlin comes to mind. Or the late Richard Pryor.