In reply to BruceC:
Go back and ask him what he's ever done on grit....
I realise that us dinosaurs who started climbing before the wall boom like to spout about indoor climbing and people who never venture outdoors, but do we now have to worry about the staff as well?
He's clearly been on a course: such unshakeable stupidity can only come from didactic teaching in a classroom. With powerpoint slides. Practical experience teaches us to use a bit of sensible thought.
I wouldn't stop using the wall if you like it, though; personally, I'd have handed him his @rse on the spot, but going back armed with some knowledge and confidence should let you deal with him more diplomatically.
Martin