veiled chameleon has strange eating habits

[oiler17]

Pretty much all summer, my brother and his roommate have been taking care of my veiled because I was out of town for the summer and so on.. Anyway, the chameleon wouldn't eat out of his cup suddenly, and only started to eat again recently when food is help up to his mouth. He still hasn't actually shot his tongue out and eaten food.

Is this normal or is there something I should do? I've always offered crickets (sometimes dusted), superworms, giant mealworms, and the occasional wax worm. Is there something i should try with that or is it probably something else?

Oh and he still drinks normally when he's sprayed.