A presumptuous, impudent, rude, condescending, and sanctimonious fanboy who deems himself to be the all knowing in his chosen fandom. And deems anyone with lesser knowledge of the fandom to be less than.
Jane Doe: I'm really excited about this new comic book series!
Nerd Bro: Name all of his sidekicks! NOW!
Jane Doe: I'm not entirely familiar with the characters, that's why I'm excited for this series...
Nerd Bro: YOU ONLY LIKE IT BECAUSE YOU SAW THE MOVIE!
Jane Doe: Well, it's the main reason why I'm excited for it. I enjoyed the movie and I want to know more about the universe. What the hell is your problem?
Nerd Bro: I'M EMBARRASSINGLY INSECURE WITH MYSELF AND FEEL THREATENED WHEN PEOPLE LIKE WHAT I LIKE! I'M PATHETIC, THAT'S MY PROBLEM!