Cage aggression is more a myth than anything else. There is no need to remove your snake from his enclosure to feed, as moving them shortly after eating causes stress and possibility of regurgitation.

To the OP: bp bites really don't hurt, the tend to bleed more than what they should, if you ask me. Paper cuts hurt more . You can continue to hold your snake so he learns you are not going to hurt him, but only for a few mins as handling them can add more stress. Usually when they are going into shed is when they're more pissy.