‘What harmless thing instantly makes you think, "I don't trust this person"?’: Reddit debate about small, seemingly harmless traits that immediately signal a person is untrustworthy

I'm starting to notice that being friendly isn't a positive thing anymoreI was on /askreddit today, and I stumbled upon this post. Obviously, I was intrigued and wanted to read it to see if I could find tips on improving my selection process and start distinguishing who is trustworthy from who isn't.I was surprised to see that most of the attributes people listed were things I would normally consider positive, friendly, and open. Frankly, I'm not sure if I have been wrong all this time or if people on the internet tend to be very wary of normal, outgoing folks. Of course, I believe it's the latter, so I can confidently say the advice didn't work for me.Still, I'm looking for advice on this topic, but one that is more coherent with what I see in the world- for example, people trying to learn too much information from you without revealing anything about themselves, people who treat those they consider to be of a lower status badly compared to those 'above' them, people who don't match their actions to their words, things like that, and maybe, some subtle appreciation about character that makes you untrustworthy that I have never come across.Has anyone got any advice?