I am with the crowd that says it is insanity to walk around in bare feet.
It is, in my humble opinion, a very probable situation that there could be broken glass on an airplane floor. An aircraft is a small metal tube where pax get served beverages in glasses that have to be perched on wobbly tables, and that tube flies through turbulence. That many glasses don't break every flight is a small miracle.
Pax such as the OP who insist on walking around in the dark in such an environment with bare feet are not being reasonable. And in cases such as this the
OP is then responsible for soiling the cabin floor with copious amounts of his blood. That is a tad more dangerous than the urine on the toilet floor! And so much harder for the crew or cleaning staff to get rid of.
Anyway, having said all that, a few hours ago on a trans-pac flight I did myself go to the toilet mid flight just wearing socks
Edit: To the OP, I am not attacking you here - just voicing another viewpoint. I like your open and sensible attitude, please keep posting in AFF