I think it also has a lot to do with where on their body you are touching them. They'll whip away if you try touching their heads, and even touching their necks makes them nervous. I've noticed mine don't like being touching along their bellies or their tails. Both seem indifferent to being touched along their spines though.

Also once mine acclimated better they became much less skittish around me. My older bigger ball python will take around my arm sometimes if I have it the tank.