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?

https://lemm.ee/post/4057430

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? - lemm.ee

Being “vetted” by them…
For real this seems like a major red flag.