"So, yes, Mr. Seinfeld, we college students are politically correct. We will call out sexism and racism if we hear it. But if you're going to come to my college and perform in front of me, be prepared to write up a set that doesn't just offend me, but has something to say."
If you don't want a comic to say something, just don't laugh when they say it. What gall someone has to have to feel the need to impose boundaries on comedic content, 'calling out' comedians who dare broach taboo subject matter. What a fine bunch of totalitarians these kids will make.