How's your set up?
Balls don't strike for no reason. Are you sure he's being aggressive and not defensive? Aside from the hand thing, does his enclosure have enough security? Is he hungry? These could also be related to striking.
Personally, I only handle my snakes during cleaning time. Sometimes other rare occasions. They don't like being held, just simply tolerate it. Never had any of my snakes strike, be aggressive, or act 'unsocialized'.
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