I handle my young bp a lot tbh, I also keep changing his setup when he is wandering around.
So, I always feed him in his enclosure using very long tweezers (frozen mice) and until today I've had like no problems with substrate or something like that except one time when he didn't get a small piece of wood out of his mouth after eating but he allowed me to take it out without complaining
Furthermore he never confused my hand with food even if he's very hungry

I guess it's always depending on the substrate you are using and, as always, the character of your snake^^