I would imagine it's probably behavioral, but could you explain more about the "Derpy" eating? If he's not eating, that could be indicative of something else, but also could be stress related.
Snakes can have odd ways of showing they are uncomfortable or want to be left alone. How old is he? Young snakes who are learning to trust and/or not used to being handled can show stress more than "established" snakes. Even Solana, my sweet, sweet, and docile, corn snake, struck a few times the first few times I went to handle her (closed mouth - not that I would have felt it at 8g anyway). Once she realized I wasn't a threat (which happened fast), she's never done it since.
Regarding being left alone, my corn snake, Figment, occasionally will do this weird stop/start shake/movement thing. It's almost like a locomotive moving then stopping, then moving, then stopping, etc. but quickly. Hasn't done it in a long time, but seemed to be telling me he wanted to be left alone and his way of acting all scary. He's never struck, or been aggressive towards me in any way, but has done this weird thing from time to time.
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