I think this site has popped up as a response to the lack of civility in air travel. What was once a dress up affair is now as low-brow as it gets.

I don't approve of the website because I find it a bit rude, but when dealing with total strangers, respect their personal space as best you can. I don't think feet up on an airplane is ever appropriate, or cutting your nails, or disposing of human waste in the aisle. I've never actually seen any of this behavior, despite frequent travel, but I'm sure it happens.