Most Helpful Guys
could be the way they were bought up, or could be they were mean in school. could be they just don't like no one
The way they appear, if they are irritable, upset, or stuck up that can all effect someone's approach
Most Helpful Girls
You mean in general, or to try and date?
If it's the latter, I'd say negative body language or vibes they give off (arms crossed, frowning, resting bitch face... yeah men have it too, lol).
Or their personality- if they come off as rude, obnoxious, or a know-it-all, it's hard to talk to them without feeling like you're bothering them
If they have a non inviting persona about them, that’ll make it hard for me to approach them.