All the people filled with moral outrage in this thread crack me up. Comedians have been doing shit like this for ages, this isn't exactly anything new. It reminds me of the sort of thing George Carlin might've said.
Because comedy has always been about that, you know? Well, not all comedy, but a certain segment of comedy has been about pushing borders, knocking over taboos. Can't murder a pretty teenage girl (in a film, not in real life of course) who thinks the world revolves around her and joke about it? Why the fuck not?
If you can't deal with that and want all of your films to have nice clean moral messages, then fine, just stay away from it. Keep expressing moral outrage about it, and I'll keep laughing about it. Those of us who can laugh about shit like this are not "amoral", we typically just reserve our outrage for real life rather than works of fiction.