I played with a guy once who would stop me or my regular partner in the middle of our backswing to give correctional notes. He is also one of those guys who concedes any putt that is within 5 feet of the hole, and plays what he calls "ready golf", meaning that he is rushing everyone on every swing and he won't let you analyze your shot at all. He and his son have repeatedly asked when me and my bud are going with them again, and we just ignore them.
I have two other regulars that aren't very good yet, by that I mean they shoot upwards of 10 per hole, and they tend to lose a lot of golf balls in the woods. Not such a big deal, and I still stink so the amount of shots really doesn't bother me, but it is the amount of time they will spend looking for a lost ball. I will generally look for a ball for about a minute, and if I can't find it by then, I just drop and take the penalty. These two will literally take 6 or 7 minutes per hole to search for a lost ball. I swear, when my normal partner and I stopped going with them, we shaved an hour and a half of of nine holes. We now play 9 in about 1 hr and 45 minutes.