That Joke Isn’t Funny Anymore (and it’s not because of “political correctness”)
Julia Serano

I think it’s important to call this crap out for what it really is, which crass, ignorant, and lazy. Gods know avoiding socially controversial topics doesn’t guarantee that a comedian will be any good, but if they DO go there, it’s usually because they just don’t want to put in the effort. The older comedians like Seinfeld, Rock, and Maher, they came up when you could pretty much say anything you wanted and not get called on it. For them, it’s just easier to play to the audience you know, and who accepts your material for what it is, than it is to try to change for a different type of audience.