I don't see anything wrong in role playing.
Some guys like to get dressed up in diapers and have an old woman change their diaper and then suck their cock. Yeah, it seems kinda sick to me too...but it's just role playing.
This is all about fantasy, and it's none of our business nor is it our place to criticize what others have in the backs of their sexual fantasies.
Especially, since we all have shit that we sometimes fantasize about that we don't tell anyone about. It's just human nature.