I'm a chain smoker, so I'm always out and about, so people aknowledge me because they see me around. I've met some of my best friends this way, and it's fun to watch the evolution of this kind of relationship.

I don't judge on looks, per se, but their degree of how pissed off they look. Some people just don't look friendly, so they can fell the burn of my non-aknowledgement.