I can see both sides of this situation.
I don't know what the extent of "busting on me on the way to report" was, but if it was enough to distract me from the job at hand - reporting the foul - it needs to be dealt with. Each of us is going to have a different level of what is distracting.
From my reading of the OP, the coaches comments were enough to distract MidMadness. Now he has to delay the game a bit to talk to his partner, and the table, to try to get the correct number. This whole time, I'm sure the coach is being an angel on the sideline and patiently waiting to resume the game.
MidMadness resolves the situation the best he can and prepares to resume the game, but coach can't resist one more shot to add to the situation
he helped create in the first place! I don't have a problem with whacking him here.
I could also see not whacking him and dealing with the comment another way. Whatever path you choose, the coach has to know that the comment was inappropriate and the game is moving on.