One of the aspects of politically-incorrect humor that the politically-correct will never get is the usefulness of "inappropriate humor" in determining who, among the people one finds oneself working or living with, is actually *worth* associating with.
All one has to do to tell the difference is "push the envelope" a little. Tell a joke that pokes fun at things most in the environment are too guru-whipped to poke fun at. Do something that "breaks the rules," but in a way that only a fool would make an issue of it, because to do so would be to reveal them as the fools they are. Do this enough times, and you are able to suss out who in your environment is worthy of hanging with (in the sense of "potential friends") and who is just there in the environment taking up space and not really worth bothering with overmuch. There are times when I think that Jerry put up with my antics because he was a closet "button pusher" himself, but his position in the movement didn't allow him to act it out the way he would have if he just hadn't given a shit. There is a certain freedom in not giving a shit.