lukewarm fan

Someone who claims to be a huge fan of of a musician or band, but really only know one or two songs by them. It's extremely annoying.

Simple bitch: Omg I LOVE Ed Sheeran so much!
Actual fan: Oh really, what songs of his do you like?
Simple bitch: Lego house!
Actual fan: Me too, any others?
Simple bitch: Uhhhhhhhhhh...
Actual fan: My bad, didn't realize you were a lukewarm fan.
Simple bitch: Wha?
Actual fan: Bye bitch.

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