how dare you allow your guns to make loud noises! Don't you know to shush your guns when they misbehave like that
Unless you were deliberately breaking the rules in some way I can't believe you'd even give that consideration. Its a range, its going to be loud.
You sound polite and he sounds like a toolhead. What stumps me is that the range officer actually came over to 'test a loud pistol' rather then givin the guy his strangest look and walking off.
Unless theres more to this story - Are there velocity restrictions on that range perhaps?