Cowboy Ref
"VAR Check!"
I'd take a firm stance at the first dissent with a warning, then if theres another outburst, a yellow card. Let him know at the first dissent he makes.
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Problem with this is observer's will have you and often you set the bar high regarding loud and persistent dissent.Yes, agree with Steve above. I've had similar experiences many times. I now basically ignore all comments from coaches and pretend I can't hear them. Works pretty well.