What are you even talking about? Swifties love TS and think she's great, but enjoying who you enjoy is not "insulting" to other artists. Why do you get to like who you like but they don't?

And I'm guessing all those fans also do enjoy other artists as well, because most people who love music like more than one person. People who went crazy for The Beatles or Elvis also listened to other music.

Instead of being belligerent and defensive about it, why don't you Google it and find out more about this phenomenon. There are copious numbers of articles out there about why Swift fans are so passionate about her (and I've already explained it to you once, so there's that as well).