Yep. Colombo was in a bar in Brooklyn celebrating his birthday with friends. Carlo Gambino came into the bar with a few friends of his own. He walked over to Colombo and told him to cut out all the crap, slapped him hard in the face and walked out. Colombo had to take it.
He was shot two weeks later.

I heard the story from someone who knew someone that was there. It was also reported in a book later written by a former NY police commissioner.