A brief story I've posted before . . . .

A number of years ago, flying CO, (when I was much younger and didn't think about the lav floors ), I attempted to go to the FC lav in my socks, and the FA told that IT WAS AN FAA REGULATION that you had to wear shoes go to the lav!!!

That said, I have noticed over the last year or 2, a diminishing amount enforcement of F lav vs Y lav stuff. <not that I care, really> I just remember that a few years ago and earlier, it was practically UNHEARD OF for Y pax to use the F lav unless the cart was blocking the aisle.