In a second part of the video released by Monty McCutchen, he talks about bench decorum. 

Sometimes the bench can have a big impact in the play.  This is not necessary for the game and will no longer be tolerated.  The crowd in the stands is not directly a part of the game.  The bench personnel is a part of the game, but can not be a part of live ball action.

Please checkk out the video below.