Has he recently shed? Their skin is more sensitive right afterwards.
You say he was rescued & he's a good eater, so it just may be that he's feeling BETTER now -with better conditions & enough warmth & food to give him the energy
to fight back about handling. Sometimes a snake that is passive about handling is just one that doesn't feel well...so look at the bright side, maybe you've made
him healthier & he's giving his "opinions" on things now?
Don't jump to conclusions that he "hates handling"...just try to be patient & understand where he's coming from...we are still big scary predators for all that snakes
know...if we were his size, we'd be defensive too. Maybe a lighter touch, & taking it slower would help...