Let's be honest and say that the sort of person who thinks it's rude to expect a guest to comply with a polite request regarding one's home is the sort of person you don't want stepping foot into where you live, they will likely light up a cigarette and leave the door open so your cat can run out
I'd have mostly agreed with this but I've somehow been suddenly sent back 18 years to a time I was looking for a room to rent. The owner got the house in the divorce, couldn't afford the mortgage without a lodger, and was clearly very bitter, as he spent most of the tour complaining about his ex.
He invited me in, said to take shoes off (and said I could borrow a pair of communal kitchen flip flops when needed), and then double locked the door behind me. The lack of shoes as he explained how a previous (female) lodger was leaving because she'd asked for a lock really added to my discomfort.