"I don't like it so it must be bad" in relation to all kinds of media. So many people can't accept that something just isn't meant for them. There are literally thousands of games, movies and albums getting released every year so if you don't like something, just don't buy it and move on instead of complaining to (and sometimes about) those of us who are looking forward to it.
Edit: this might not strictly be the most toxic behavior but it makes social interactions super annoying, even in small groups and it seems to coincide with people who are overall fond of forcing their personal views and beliefs on others.