i agree their are various ways to handle situations that come up. i usually try to ask and see what the problem is. if it's something i've done and 'm wrong, i'll apologize.
i run into people that i knew a long time ago. i say "hi" and most say at least "hi" back, some ignore me. after a few times of saying "hi" , I quit saying "hi" and walk on. a few yrs ago, at my HS reunion, I was talking to a guy I knew. he looked at my name tag, and shook his head. I don't remember you, he said. but 2 wks later when I walked on his used car lot, he knew who I was. I don't like games.
14 yrs ago, we had some "friends" spread rumors & lies about us. I tried to get to the bottom of it, but had no luck. I started ignoring these people...that's what they were doing to us in our presence. after a few months, they wanted everything to go back the way it was before their lies, I refused w/out an explanation. they refused that, so I said fuck'em. with "friends" like that who needs enemies??