The comedian pushing the envelope of social taboos these days is Dave Chappelle. He seems to have irritated many people with his recent routine poking fun at several untouchable icons.
I keep waiting for the PC bubble to deflate, but it appears to have a steady stream of hot air keeping it inflated.
This is not a new concept and comedians like Lenny Bruce were jailed for breaking societal norms.
Later George Carlin tread that same path with his infamous routine "7 words you cannot say on television". That case went up to the supreme court who ruled FCC could regulate offensive speech, but did not opine on those specific words or define offensive.
Richard Pryor was known for some incendiary stand-up routines.
Eddie Murphy and others have tried to channel their predecessors. I don't know if Dave Chappell is all that revolutionary, but maybe the room has gotten tougher for such comedy over recent years. He has certainly shocked them awake.
Many established comedians refuse to perform at modern colleges, that used to be a prime audience for them, because of the changed social climate.
Interesting times...
JR
PS: Humor and satire has long been a vehicle for social and political commentary, at least it was. :