I often see posts on forums saying things like, "Those Japanese guys are sex offenders and their games and their games are shit, time to shoot more foreigners in Clal of Duty." That may be a slight exaggeration, but it is a common sort of opinion.
Other tropes I hate:
That joke that everything is about the Hokey Pokey. I hear that joke an average of a few times every week. It was never funny, it never changed, and I always hated it.
Games like Until Dawn and Telltale and and David Cage shit where the game is nothing but mashing buttons, and the stories are terrible. I like gameplay and good stories, not pushing a button like a monkey.
No longer having genres like adventure games and space simulators. I miss those and I hope No Man's Sky and Star Citizens can resurrect the latter. My only outlet for adventure games is obscure indie games, from classics like Space Quest Incinerations and Vohaul Strikes Back, Dropsy, Randall's Monday and the Ben There, Dan That series to shit like To The Moon and Gemini Rue.
Vaporwave: I still want to see the sequels to Day of the Tentacle, Sam and Max, Hitchhiker's Guide to the Galaxy, Spellcasting 301, Superhero League of Hoboken, Beyond Good and Evil and original games like Champions, that game about Las Vegas Dave Wong was writing, etc.
Toads, the most annoying, retarded characters ever and the only reason most Mario games are not perfect.
Comic books that take themselves too seriously and have no imagination, like most of D.C. and Marvel these day. I love Chew it is just as insane as classic '60s comics.
Elves, who are always genocidal religious fanatics who live in the woods and complain about technology. They are the fantasy equivalents of crazy survivalists.
Guys like Habermann and the C.R.P.G. Addict who refuse to play more than one type of game. We have 40 years of classic games with unlimited variety, yet they obsessively play the same thing forever.