I've been on a jag about this on several previous occasions - for hundreds of years, there was a tacit agreement between human beings that, when one entered the public realm, the least they could do was importune others as little as possible. The general peace - we are all in this together so, please, do not disrupt it without good reason. Dress, demeanor, comportment, conduct was as much a part of decency as not cheating, hurting, lying. Civilized.
Yes, a lot of this was forced upon folks by self-appointed arbiters of culture, morality, religion and there was a LOT of wrong in what they did and how they did it. That does not mean that manners weren't the right idea. It would still be a good thing, in fact the world would indeed be a better place, if each person left the house with cooperating with others & not offending them unduly as a significant part of their public agenda and that they, in turn, could reasonably hope to receive the same consideration for themselves and their children. Simple as that.