Earlier quoted context omitted.
A society is made up of people. The way people act, dress, talk, or do anything else has a pretty direct impact on other people in that society. Unless your definition of society is an extremely disconnected one, comprised of alienated individuals that have no interaction with each other, yes, it does affect other people.
It only affects people who care about what other people wear, and those people shouldn’t have any sort of societal influence because that’s stupid. Name literally one reason that wearing pajamas in public will cause another person actual harm and I’ll take back this statement.
All these acts belie any notion that maintaining our shared spaces is a personal responsibility and that those spaces could hame some function beyond selling or maximizing immediate personal utility - whether that be inspiring wonder, awe, tranquility, community or contemplation. Consider the public spaces we actually choose to visit, or why we built them in the first place.
I don’t wish to enforce a dress code on anyone. All the same, wearing pajamas in public doesn’t read as a defiant act of personal expression to me.