"you know better than to argue coach, that is enough"???
Poleeeeeeeeeeeease! They usually DON'T know better, which is why they do.
Give them a little bit of "release" time. Ask them if they want to hear what you seen. If not, turn a walk away. If they do, explain what you seen, then turn and walk away.
If they start to repeat themselves, tell them "This conversation is over". If they keep after you, put your hand up, palm facing them and say "Coach, that is enough arguing the call. No more!!!" in a loud voice. THEN if he says any more about the call, eject him.
It is important to give the verbal warning loud enough for everybody to hear, and to also state "arguing the call". You have at that point listened to what he has to say, in a calm matter (everybody seen that), and he is still arguing so you have issued a warning, complete with the physical warning sign (your arm straight out with palm facing him). If he keeps arguing, NOBODY in the park can possibly blame you for ejecting him!
Trust me, this works like a charm, but it is important that you do everything right.
Statements like "you know better than to argue" is NOT a warning, and "cut it out" is a weak order. "No more arguing the call" with your palm out towards him is a very obvious warning, AND a specific order to stop what he is doing.
Give it a try next time and report back your success!
