I grew up with a non-jw father who had many non-jw friends that we socialized with. I had no problem making friends with non-jws because I already had as a jw. My father had not socialized with his family for years because of grudges from the past, so that's why we never saw them.
As to people at the KH, I knew that I had very few were true friends. That made me think, why were non-jws so caring and helpful especially when we had troubles and jws stayed away from us even more thinking the would catch the plague of worldliness we had caught from our non-jw father. Now that doesn't mean we didn't have non-jw family (my in-laws) who shunned my husband and I before when we were jws and after when we left. We attended funerals and weddings and anniversaries, etc., before we when we were jws, so we had not given offense that way.
I always wondered how jws could go door to door and talk to strangers about the kingdom, people that they believed were already toast at Armageddon. It wasn't the eternal lives of those strangers that motivated them to preach and sometimes teach, it was securing their own eternal life.