HMMMMM
1) Have they been to my house on a Holiday? Any friend is more than welcome to stop by for a meal, staying the night is a whole other thing!
2) Have they given me/you a ride when your car broke down?
3) Have they ever bailed me out of jail? (Long ago, I don't want to discuss it!)
If none of the above apply, they are acquaintances....however most of which I personally would gladly do #2 for, would most likely do #1, and might be coerced to do #3 for a few, VERY FEW!
I would be happy to tell them "how" I play any hole on any course if asked, even those not on my friends list,now if they get arrested tough sh!t!