Years ago, I was part of a Facebook group for "Thrash Metal" fans. If someone mentioned Pantera, people would get angry and make comments like: "Pantera isn't THRASH METAL! They are GROOVE METAL!" Buh. Get a life.
It gets worse. Every day, someone would ask this group for the best Metallica song. Seriously, how boring can you get? I finally replied with "get a life." This post got several likes. Then I left the group.