The only people i care about are my close friends and family. If they're not in those groups I just don't care. I don't even make friends anymore. I have enough of them.
If it's at work I'll probably be happy if they're nicer. I might be more inclined to be nicer myself. But if i don't depend on them for my job, i just don't care, again.
I used to care too much about what everyone thought and how they treated me. It was a waste of time.