That is so Nasty!

I have a question. Why is the mucus inside of my nasal cavity fine, but as soon as it leave's via nose, mouth, or other it is super gross? Why is it that when any non-solid substance inside my body leave's it is nasty nation. The only change is location. Why can my dad pick his ear with a with his car keys for hours on end and not be gross, but any form of nose picking make's little Suzy Hutchinson puke in her mouth a little bit? Is that paper covering placed over the toilet seat a guardian angel saving souls from mucus membrane's and bacteria's of doom?
The reason we should be so disgusted by contact with fluids/gels that are supposed to be internal is because they may carry diseases. The bottom line is, if you dive into a huge steaming pile of rhino poop then you'll probably get the west nile virus and a scorching case of herpes. How do we give each other colds you ask? By touching each other's mucus. If you decide to dive into a pool of Patrick Ewing's sweat you'll probably become covered with scabies's and mutate into a beastly form, that's what happened to Tom Petty.
I guess these blog doesn't have any real purpose. Thanks for reading.