When one of my acquaintances turned out to have been beating his wife and kids, and one of my friends was like, "Hey, remember our friend..." I would correct them immediately. He was never my friend. He was an a-hole and a jerk to everyone, all the time, in one of those amusing-to-an-in-group-but-denigrating-to-the-out-group-or-person sort of way. I only tolerated him because some of my friends considered him a friend, and I didn't want to cause problems. And I regret that.
But he was never my friend. If I live to 125, life will still be too short to spend any of it with terrible, terrible people.