Players fighting amongst each other
One thing that I forgot to include in the discussion that I thought of at practice last night. While I don't worry too much about kids fighting in the heat of the moment and we do absolutely address bullying, we do not ignore it.
Just like I do with late hits after the whistle and egregious things that would be called a penalty in a game (by a "reasonable" referee, if they exist), I will give the players a penalty because they hurt the team. It usually is just a run with the Godzilla, but we need to have kids understand that if they fight during a game or retaliate in certain circumstances, they are hurting their team and there are consequences (personal foul, ejections, etc.). As such, we need them to learn that in practice and not in the game (preferably).