Most people "decay" social relations as they get farther away. Presumably, you want to like everyone that you associate with. But if one or two of the people they associate with is somehow objectionable, you kinda write it off as bad taste and tolerate them as best as possible, as long as you're not invited to the same dinner parties. And most people don't care at all who their friends-of-friends-of-friends are.

If you believe the 6-degrees-of-separation theory, this is a very good thing. Otherwise, we'd all be connected to some serial killer, or traitor, or banker. Heck, if you go out even 2 degrees of separation, I'm sure there are people in my social network that I find rather detestable.