Is it True that Some People Insist that Upon Entering a House One Must Remove One's Shoes?

What if the house is actually a shoe?
What if the house is actually a shoe?
I mean, why do we have door mats if we shouldn't wear them inside? Walking around barefoot is potentially dangerous, because what if you step on something sharp, like a speck of broken glass? What about the risk of developing fungal growths, like Athlete's Foot?
Is it True that Some People Insist that Upon Entering a House One Must Remove One's Shoes?
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