it really all depends on a number of factors
1. my mood, state of mind, what's occupying my interest at the time, etc.
2. how compelling, attractive, interesting i find them
3. the potential nature of our relationship and its payoff - for instance in a work situation: is this someone who is going to be my boss, or am i going to be their boss - it makes a difference
4. how they act towards me initially - the "vibes" or "energy" they put out in my direction
5. whether i find them intimidating or "safe"
6. how much time i actually spend with them, or the proximity of our interaction - i naturally form a different relationship with someone i see all day everyday versus someone i see only occasionally
7. the "click" factor - sometimes it's hard to put my finger on - for whatever reason, we just seem to click - we're on the same wavelength, share similar thoughts, experiences, opinions, etc.
Coyote!
This will be a checklist for me to live by.
However, as I remember, and consider my actions for next time I find a stranger, it'll never be straightforward. It's so much easier and comfortable for me to wink, smile and then ignore & walk the other way, feeling the horror and dislike, in return. Locker room, weights room - where I'm heading
There's one stranger I've been introduced to by my current
one friend in my town (who I know, because of my last girlfriend from year 1996 to 2000; she has a very close set of mates, because they all grew up in the same town) who was my only chance to ever meet anybody new. He's a natural social, finding new. A stranger is an alien to me. One of those who refuses to ever 'do any work at all' and loves to scrimp on government payouts only, and hated school, and walked out early. This is the group how I knew from that girlfriend. Those two dropped by yesterday, ringing my doorbell endlessly yesterday, which I felt like cowering, taking action of ignoring them, as the equivalent of not asking the phone. My feelings came out but putting clothes on and coming out to meet them. I wanna be friendly, and don't like being cold, but it's more sensible to ignore if you know you can't get on!
There are just about everything else in the world I can deal with, if it's not a human:
Seeing
cars in the street as I walk past, or drive past them, I'll remember which I'll like for the future... don't want a saloon agin, as it's too big or me. The colour. The size. The manufacturer. Drive layout: I want a rear drive with a front engine, because I haven't tried that before. I'm sick of FF front wheel drive hatches. German or Japanese. No less than 2.0 litre. Unlikely a big 4x4. Maybe a low one. Impreza or quattro. I used to talk this stuff with that girlfriend when the car, pointing out car types... 'do you remember that one..?'
I can deal with weather: cold / hot / hail / snow / ice / disasters: floods, wind, explosions...
others cower in the street, dreadfully frightened of occasional light rain, with an umbrella, once the rain has stopped. Crying when it's tooo cold
I can cope with animals: if they bite - 'quitos, the jungle, big cats, snakes, safari
I can deal with any machine that's not working properly. I'll fix it.
People:

colleagues or boss: clam up. Walk the other way. My way or the highway. I like the word ' compromise '. Can't do it with strangers. They don't do it with me.
I want to try the list, and change