Yeah, a dark sense of humor is a pretty common coping mechanism for millennials and gen Z, although gen Z tends to be more nihilistic (and rightly so considering the state of the world)
“But flippancy is the best of all. In the first place it is very economical. Only a clever human can make a real Joke about virtue, or indeed about anything else; any of them can be trained to talk as if virtue were funny. Among flippant people the joke is always assumed to have been made. No one actually makes it; but every serious subject is discussed in a manner which implies that they have already found a ridiculous side to it. If prolonged, the habit of Flippancy builds up around a man the finest armour-plating against the Enemy that I know, and it is quite free from the dangers inherent in the other sources of laughter.
It is a thousand miles away from joy: it deadens, instead of sharpening, the intellect; and it excites no affection between those who practise it.”
It's a TV show. No idea what a "FRIENDS list" is, though. Episode list? IMDb cast sheet? I guess the gang did get pretty dark sometimes, but dementia seems a stretch.