It shouldn't matter what your den leader thinks of your DS. She is just a facilitator really.
Well, ideally. But I think we all know that in reality, a negative attitude from an adult--mere "facilitator" or no--can really hurt a kid. Especially socially. All it takes is one well-placed "if you're so smart..." comments or a subtle treatment like a social leper and a kid is ostracized by the other kids.
I don't think that potential is reason to keep the kid out of Scouts, but I do understand the concern Cathy is expressing.
I'm not disagreeing with your fundamental advice, MON. But I do think a bad attitude from the adult in charge of the group about a GT child can ruin a potentially good thing.
