Over the years on a lot of different Forums I have seen this same thread come up. It has been answered in a lot of different ways.
I will answer it the way I handled it. This was a HS varsity baseball game between two rivals:
The bench was chirping about the strike zone and between innings I talked to the home HC and stated, "Coach, control you bench there will be no arguing of balls and strikes". That was all I said to the coach.
In the bottom of the 4th inning with 1 out, I heard the birds again. I called time. Walked over to the bench and the first person I came to I pointed and said "you, you're gone for arguing balls and strikes." The person standing next to him piped up and said "It wasn't him". I pointed at that person and said "You, you're gone for arguing balls and strikes." By that time the HC had gotten there form 3rd base and started yelling at his bench. I stood there while he talked to them.
The HC and I went about 15 feet away and had a discussion about bench conduct. I stated "Coach every time I have to stop the game because of your bench, somebody is going home early."
The HC went back to his bench and for the rest of the game his bench was very very quiet.