Because you’re probably an adult, and we expect so much more of you.
Using the aircraft bulkhead as a footrest.
The aircraft bulkhead is not your personal ottoman. It is not there for you to put your bare, un-socked, smelly feet on. Please keep your toesies covered and off our walls. Your seatmates will thank you.
Using the lavatory barefoot or with just socks on.
As you’ve probably heard before, that is not water your standing in. Besides, sometimes those planes turn around so quick at out-of-base stations that cleaners at that station don’t even have time to clean the lavatories properly. And to be honest, sometimes they forget, or just don’t clean them.