Starting OT with 2 shots and the ball

[refaz]

Good technical.

However, coaches are just as much A-type personalities as refs. If they get the last word sometimes - who cares? Let it go. I do (at least I try to).

Also note, assistants often become head coaches. I treat them all with respect (so long as they reciprocate).

You should look at this as a learning opportunity rather than getting a pat on the back. You're reffing a tight game that both teams want to win. Then you tell the coach to do something "or else" - this is a challenge. Now, he should have heeded this warning. But it's not all that surprising that given how you handled it - he challenged back. Try using different words with the coach that don't include an ultimatum. "Coach, help me out with your bench/assistants please."

All that said, his words warrant a technical. In the future you might be able to avoid it all and not have to start the overtime with a technical.