it is normal. my male veiled is like a pitbull he bites and then starts thrashing around. he hisses constantly. i hand feed him daily, he is not aggresive then but as soon as where done he puffs up and starts hissing again. thats just his personality. i only hold him once a month to super clean his home. i tried alot of different things, silkies,hornworms ect.. fed from my hand. he has no problem he will even crawl onto my hand. as soon as the treat is gone he is back to the demon cham. i dont mind too much, i never planned on holding that much any way. in nature agression is a sign of health. non agressive predators are often sick or weak.