Verbal Abuse - how much is too much?

[BballRookie]

New guy here: I was officiating in city league a while ago and during a very heated game I made a delayed call and one team went ballastic. One of the players on the heated team was an official, and he lost his cool. They had no subs, so fatigue was at play, and really he was furious because they lost a giant lead and nearly the game(they won in the end).

I know I screwed up the call so I let it go and ignored him. What consitutes as verbal abuse? Swearing? A player saying "you suck ref!"? Making chippy remarks? Insulting the level you are officiating at?

Any comments, direction, or crazy stories are appeciated.