I just read not showering for days is a type of fetish. and someone has fetish for horse and cow feaces.. Seriously wtf is wrong with people?

Right, and there is probably somebody chewing on part of the corpse of an animal reading this and agreeing completely. There is plenty wrong with people, there is more evidence of that in what is normal human behavior than you can from abnormal behavior. I don't know a single person who does not hold disgusting views, it is human nature.

Or you could get a little bit philosophical and say that the meaning of disgusting is completely subjective since the ambiguity of language tends to shift nearly every definition into each of our own personal worldviews.