Political correctness is not the same as not being racist. Or rather, being racist is a subset of being politically incorrect. There's millions of people out there who are politically incorrect without being racist. South Park has been doing it for decades.
And anyone who thinks that telling somebody that calling a Black Muslim a terrorist ape is wrong is just being 'politically correct' is trying to sell their racism as counterculturism. When really, it's just plain racism.
So yes, political correctness is stupid. Political correctness is editing reality toward an ideal and penalizing anyone who denies the illusion. Where political correctness and I can completely agree, however, is that Roseanne is a f***ing racist. What Roseanne tweeted is not maverick counterculturism, it's plain unadulterated hate.
And Bill Maher's politics are fine but he sucks because he's not funny. He's like what liberal political comedy was in the 90s before Jon Stewart made it intelligent, only he's still doing it that way.