I like to gossip about fictional TV characters.
There's no way to be tasteless or irresponsible or just batshit crazy when speculating about the heroes and villains on The Good Wife or Justified. I don't feel like an ass for snarking about the bedroom habits of characters on 30 Rock or hoping that someone on Breaking Bad is tortured and killed. They're not victims of sensationalistic journalism, and it's impossible to smear them.
Plus, everyone who watches a TV series (or sees a play, reads a novel, etc.) is on the same page: We know what the author wants us to know about a character and no more. We all have access to all the truth that exists. We're free to imagine more, but we can't get self-righteous and claim certainty that Breaking Bad's Walter White had lousy parents or that Community's Abed is a secret anti-colonialist Kenyan.
But a lot of people think it's a waste of time to offer opinions about fictional characters. They'd rather offer opinions about real people they don't know.