OK man, I see the issue here.
You're talking about, "in the news, in academia, in the movie industry, in hiring, basically in the public culture". Whereas I'm talking about how people talk in private social situations. The professional world should be professional, and separate from your private life. (You don't talk to your spouse and kids the way you talk to your coworkers unless something is very, very wrong in one place or the other.)
As I've already said, no, you can't go up to your boss and start joking about killing cops, or about "gold digging women like his daughter". But again, who does that? That's just dumb.
Yes, in the professional world, guess what? They only want professionals. That's not some off the wall notion that has only arisen "...in the last say 5 years..." It's been that way since forever.
So I'm sorry man, I'm just not gonna feel bad for you because you can't denigrate handicapped people, or hispanics, or whatever at work. But I will call you a dummy for doing so, and I'll add that it's unprofessional.
But as I said before, at parties or whatever, there is no way you can tell me that people don't joke about those same handicapped people and hispanics. It happens all the time.