Obsessedformation
This is when fans argue, fight, and even try to ruin other fans just because they like the same celebrity. They act like they're the only real fan and will do anything to prove it. Obsessedformation is like a love-hate war that never ends.
'You're not a real fan. You only like Taylor because she's hot.'
'I know more about Ariana than you ever will.'
'You're a fake fan. I've been following her since 2007.'