I'd ask HIM cite the particular code article, whether NEC or a local code addition. He cannot just say "no". He's obliged to provide you with this. No need to be rude about it since you are just asking the basis for his decision.
A cop can't pull you over and write you a ticket just because he feels like it either. They must also cite what you did wrong, by referencing the locally adopted code.
Has the '08 code even been adopted in your area yet?
"But the guy at Home Depot said it would work."