Nothing wrong with callouses, but it's not a question of friction. Hitting your finger and hand joints against narrow strips of metal produces painful bruises, swelling and difficulty moving those joints.
Drumming isn't a contact sport.
I make hand contact all the time with a steel when playing timbales, and I consider playing congas in a salsa band or bata in a toque very much a "contact sport" (for lack of a better term).
and just to clarify: no blisters are not a good thing, but when you're playing for 6-8 hours a day, they happen. Callouses are develop to protect the knuckles if you properly develop your hands and play with good technique. But then again, anyone playing a snare drum with their hands probably hasn't thought things through to the point of wanting to learn good technique.