Actually not being used to be handled has nothing to do with the issue, I don't handle any of my animals unless I do maintenance and none have that type of issue.
Recommending handling has a solution for a BP (not talking about other species) to settle down may actually create more problems.
If the animal is stress leave him alone.
Hatchlings and Juvies are defensive that is part of owning snakes, if you own snakes you will get bit, those are wild animals they are not domesticated and only learn to eventually tolerate us.
In most cases aside from being defensive aggression is linked to stress or food.
I am curious can you describe your setup (enclosure size, temps etc).
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