The worst and most annoying part is that I know his tastes so well that I only recommend him things I know he will like, but he refuses to try them purely out of not believing that he'll like it.
I got him into Dark Souls, which is now his favorite game ever, Mass Effect, which is now one of his favorite games ever, Tiger and Bunny, which is now one of his favorite anime ever, Invincible, which is now his favorite comic book ever, and every single time he was just like "Nah, I ain't gonna like that shit." Every single time, it's fucking infuriating. Especially when there're so many things I know he will absolutely love.