You mean the song “Stan” by Eminem, where he talks about a guy named Stan who is a fan of something (in this case a famous person)? “[term] Stan” has been a thing for a couple years now. It was a song about an obsessive fan who doesn’t understand parasocial relationships, but the term has grown to a much broader usage.

Don’t be such a Stan Stan, sheesh 🙄

Maybe you should consider that language isn’t fixed and words change meanings all the time, especially recently coined “internet” words.