It's also the fact that people conflate being offensive with being boring. You can joke about some really dark stuff, but you have to do it in a certain way that's different than the way the olds do it, and you have to be funny. Old people are, with a few exceptions, primarily funny to other old people.
Even Jerry Seinfeld complains that he can't do gigs at colleges anymore because the young people are too easily offended, and what's worse is that people believe that and chalk it up to political correctness gone mad.
No one's offended by Jerry Seinfeld, including young people, but young people don't laugh at his jokes because he's old and out of touch. Comedians can't accept that they're past it, so it has to be something wrong with the new generation. Joking about airline food is now offensive, because there's no way prime material like that can be stale and unfunny. These people have been telling the same jokes for decades, of course they're funny!