How is wearing shoes a courtesy?

I had my shoes off and this chick is like "PUT ON YOUR SHOES IT'S A COURTESY TO THE REST OF USIFGHABNFAGHJREAGJKFHRKAHJBAKFJHIKB"
I looked on google and NOTHING came up about wearing shoes being polite.
I had socks on, which were clean, my feet were clean, and I had no sweat, so there was no odor at all from this.
Why is wearing shoes polite?
 
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