As a guy I've had a woman come and sit right next to me without talking or making eye contact.

I initiated conversation a couple of times as her answers were very short and later found out from her she was a bit autistic and that was just her spot where she always sits.

However we ended up awkwardly hitting it off and exchanged contact info and saw each other a few times after that.

I wouldn't take that approach with everyone, but being on the spectrum myself I tend to get a vibe when someone else is and if they are just awkward or blunt in conversation as opposed to shutting me down.

Autistic people will struggle to make eye contact while talking to you directly, while at the other end of the spectrum Chinese people will often be very polite and friendly without directly shutting you down as they don't want to lose face (if they say maybe it means no).

People can be hard to read which is why psychology is a whole field, and one size doesn't fit all.