Sounds like he is trying to escape, which is not a bad thing. I wouldn't say he's stressed being handled, but most snakes including bps don't "like" being handled, they tolerate it. It's not like a puppy that rolls over so you can rub it's tummy, they are just different critters and snakes don't necessarily like to be held, but they like being out of their glass/plastic box so they can plot their escape