I was going to mention this as well. I injured the plantar arch in my foot and it would not heal, until I stopped going barefoot. I generally avoid going barefoot to avoid the potential to re-injure it. I've also been on boats where the owners insist on no shoes. In the case of both houses and boats, I've always negotiated the use of non marring sole, never been worn anywhere but inside a house (or boat) shoes. If the owner isn't reasonable enough to accept that compromise, then that owner is probably not someone I want to hang with anyway.