Yeah, well, it's only really a proper 'culture' thing when certain cultures (say, Japanese, Muslim, ...) strictly forbid it and make a big drama about it.
I myself am a decidedly barefoot person. I enjoy wearing no shoes at home, in the garden, even on walkies with them dogs. I think barefoot rules. So, should I cut off my feet each time I enter my home? I think not.
If you're a reasonably clean and not too scruffy kinda person, you'll find there's nothing wrong with entering people's homes when they don't go mental about it. Other way around, I don't force anyone to take off or keep on their shoes. Sometimes, on special or, let's say 'specific' occasions I suggest people keep their shoes on or everybody takes their shoes off. As a rule of thumb, everyone is responsible for their own ass, own feet and own shoes. If someone were to bring some dog turd patina on their shoes and plasters it all over my home, I'd go pretty mental. Because they're careless hippie bastards, and there's little excuse for that.
Other than that - nah. I prefer a bit of dirt to allergies and striving for a germ-free, sterile environment. We're just not cut out for those, they make us sick and kill us.