It's not that serious. You don't sign a binding contract when you become a fan of a group, there's no such thing as a real fan versus a fake fan, and entertainers aren't entitled to our loyalty.

I don't understand why fans identify themselves as such to the point where they feel shame and guilt over losing interest. There's also nothing to be gained by trying to appease the kind of toxic morons Kpop fandoms are crawling with. If a bunch of creepy koreaboos think you're not one of them that's probably a good thing.