Laurence Olivier said in an interview once that when he plays a tragedy he always aims for the funny parts and the other way around. Because in a comedy you look for what's serious. I think that's true. Sometimes things are really funny if you're absolutely earnest. If you're really serious it's hilarious.
I would argue that we have a generation of young people particularly minorities who are no longer putting up with the kinds of things their parents put up with. They're much more self-confident. It's no longer acceptable to make fun of people because of race or sex. But it has always been present in American society.