DH and I are (or were) friends with this one couple. I've known the guy since childhood, and became good friends with his GF. Well, this friend has PTSD and is an alcoholic who is always looking for a fight whenever he drinks. A few months ago, at my godson's birthday party, he got really drunk and picked a fight with DH's brother and his nephew. Because of this, BIL said that if the friend was going to be at the wedding then he and the nephew, along with the rest of the family would not attend. So for this reason, DH spoke to the friend after the fight and informed him that he's sorry but we couldn't invite him to avoid any further conflict. Well, now that the wedding has come and gone, the friend and his GF do not acknowledge us whenever they see us at a mutual place. It's just awkward now, and we see them frequently since we have the same circle of friends. I think it's totally immature and a shame, especially when our kids are close friends. We thought they understood. Guess not.