Although my male Veiled doesn't seem to head but, occasionally if my husband tries to hold him he will flare up and hiss, and kind of bumps the side of his head against my husbands hand, never bites, just bluffs. And its strange because he never does that with me.....i suppose that goes along with the saying "dont bite the hand that feeds". I think some chameleons possess the dominant gene, and because in the wild they live a life of solitude, its just in there nature to become aggressive to anything invading there space. I once saw a special on discovery whereas they showed the reactions of a chameleon seeing himself in the mirror, like a rival on his branch, he charged and bit and hissed and HEAD BUTT, trying to ward off the reflection rival, in relation they also showed the habits of a chameleon like ours in captivity, in his cage he was seriously aggressive towards any intruder, but when they let him free range he was completely approachable, they suggested it was simply the change of him being in his territory, to being in a neutral zone. Perhaps your glove is strange to him, and to add he is just very touchy about his space. A question for you would be: Does his actions stay the same if he is removed from his home, or do you find that he submits (is passive) while out of his enclosure.
he litteraly did no stop headbutting it i finally stopped cause he was stressin out to much
i put the glove on and he will literally chase my hand back into his cage 
