To say that air travel hasn't declined to the level of bus transport, simply read the OP's post. There is little consideration for anyone but himself and not a bit of concern for health and well being of fellow passengers. I hope AA and other airlines do something about dress codes...at least where health issues are involved. To the OP:
1. Would you want FAs to go barefoot too? Should they wash their hands before handling your food? Do you bother to wear shoes/socks to the lav?
2. Should passengers bother bathing that sit next to you?
3. Do you have any decorum when you visit a restaurant? Food is handled there too.
4. Do people go barefoot in your home? Well, maybe given your post.

It is sad some care only about themselves. Selfish and boorish behavior abounds.