i know for a fact that due to my 7 yr old disabled son's erratic movements & excitability my mojo girl was really jumpy around him for quite awhile. now that i've had her for 8 months she's gotten a little more used to his ways and doesnt scare as easily around him. he's also learning how to "check" himself before approaching or petting her. this is where i tell him "check yourself." & he'll take a couple deep breaths & calm himself before reaching to touch the snake & since doing this i think the snake can sense his excitability level is lower & is alot calmer with him in return.
snakes dont "choose" people per say, not like birds, dogs & cats, anyways.
as stated they only learn to tolerate us.
of course, we can always imagine they love us but reality says thats just not the case. they'll never wag their tails when they see us & jump on us & lick our faces excitedly when we come home from a long day at work.