Remember back in the olden days when you could reasonably expect people to be competant with guns & safety? I don't, but hear it used to be like that.
I'da given the guy a yes sir sorry sir to convey that you understood and alleviate his potential fear of your safety practices and maybe even feed his ego a bit at the same time. The last thing you want is to be on the wrong side of the RO.
I'm sooo glad I don't have to use supervised ranges.