Actually once you get used to getting hit it doesn't really hurt ,it just doesn't feel good.
I only boxed when I was younger, 16-17 with friends, one dude hit like a truck and it fucking hurt.
Later, when I was training MMA (pancration/muay thai), it didnt hurt nearly as bad, even with the smaller gloves. So yeah, I dont doubt that.
Im assuming its like kicking a bag with your shins or learning to take falls/bodyshots, after a while its just kind of numb?