People who feel the need to decide whether others are "true" members of their group/fandom/whatever based on *their* standards alone.
"If you haven't read the manga, you're not a true [insert anime here] fan!"
"If you can't name more than 5 albums of [insert band here] or recite all the members' blood types, you're not a *real* fan."
"If you don't speak perfect Tagalog, know how to cook adobo blindfolded, or memorize the length of Manny Pacquiao's d**k down to the millimeter, you're not a *true* Filipino."
They act like that group/fandom is all they have going for them, so they'll fight tooth and nail to avoid getting knocked down a peg.
"If you haven't read the manga, you're not a true [insert anime here] fan!"
"If you can't name more than 5 albums of [insert band here] or recite all the members' blood types, you're not a *real* fan."
"If you don't speak perfect Tagalog, know how to cook adobo blindfolded, or memorize the length of Manny Pacquiao's d**k down to the millimeter, you're not a *true* Filipino."
They act like that group/fandom is all they have going for them, so they'll fight tooth and nail to avoid getting knocked down a peg.