When you vet someone for whether you can be close friends with them, what's a seemingly unimpactful characteristic about someone that would instantly rule them out as a potential close friend for you?
I'd go with people who refuse to admit to listening to pop music and/or center their entire personality around a music genre. I like jazz, I like classical and more, but I find the weird superiority complex specifically punk/rock/metal listeners have towards pop music very, very and I mean VERY cringe. This said, fuck Swifties, the woman alone is murdering the planet with how much she flies for no apparent reason.
Same for any pop media. Some is fine, but if they think every current trending show or movies is "the best" than I know they don't have a system of standard.