Fandom Snobbery is the act of acting in a condescending manner to someone inside or outside of your fandom. Usually takes place when fan A knows more than fan B and insults or berates them for not knowing it.
Also occurs between similar fandoms.
E.G: Between Twilight and Anne Rice fans. Harry Potter and Lord Of The Rings.
"I think that Anne Rice's allusions to Homoerotic relationships in Interview with the Vampire is truly mesmerizing and engaging reading."
"I think that Edward's constant rivalry with Jacob has homoerotic overtones."
"Yeah, but you like twilight, and that's shit. So fuck off."