Snakes do not enjoy being held, they tolerate it.
They may adjust to being calm while being held for cage cleaning, but still not like it.
(I know, I have a few that seem to enjoy it myself.)
They have a natural instinct to fear humans.
If they don't consider us a food source, or a mate, then we must be a predator.
I think routine handling helps them adjust and realize that we are not going to harm them, but that still does not mean that they enjoy our sessions as much as we do.
As soon as you go to put some of them back into their enclosure, where they feel secure, they haul
.
So when it seems like they are trying to get away, that is exactly what they are doing.