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If someone uses the word "deviant", that is basically an immediate red flag.
The reason is that it shows that they habitually dehumanize people and that usually means that they are unlikely to have anything useful to say.
It's basically a way of saying "subhumans" without actually saying subhumans. That is what makes it awful. It also has a vibe of being archaic and old.
Also, if someone isn't making the bare minimum effort to not use blatant and cartoonish dehumanizing language which looks like something which popped out from fifty years ago, then that kind of says something about them as a person.