Why are the C.H.U.D.s so picky????

Seriously... Why are they so picky about their meat? Why would demonic cannibalistic monsters care about not wanting to eat eyeballs, fingernails, and hair LOL? Aren't eyeballs supposed to be a delicacy anyway? Are there any other movies where monsters are picky about what they eat when it comes to eating people or is this the first LOL? 🤣🤣🤣🤣