If it’s not the smell then I don’t know why. I don’t like cleaning up after the dorg when she hurks on the carpet, but that’s only because it’s work that I don’t want to do and it takes away from time I’d prefer to do other things. But it never makes me gag. Even changing my kids’ diapers wasn’t a problem for me while they were infants; it was annoying to “have to do”, but not gag-inducing otherwise.
I’ve also often wondered why people reel, swoon, gag and / or faint at the sight of blood. I just get to work: stop the bleeding; clean the wound; dress it and decide what else needs to be done. Clean the walls and floor, maybe? It’s just work. (Of course, I’m one who likes to watch while the nurse sticks that sharpened pipe into my arm to take blood, too. It’s amazing that when it’s done right you can feel next to nothing.)