Autist
A word used to describe someone who is greatly invested in or addicted to a particular thing such as a genre of games/movies/tv shows. Said person has a select set of views and high standards for the thing they are so obsessed with
He’s such car autist. Whenever he hears someone talking about them he always shows off pictures of his own car and why his is better than everyone else’s.

Yeah, I am a monitor autist. If it isn’t high refresh rate, 1ms response, 27 inches, HD, and rotatable, it’s garbage.

Person 1: The American flag at my local hospital is displayed improperly and doesn’t follow the flag code. Why are they so stupid? It’s ridiculous!

Person 2: Why are you such an American flag autist? Big deal dude, get over it.