Er...actually, in genuinely posh hotels people really, really don't wander about in their PJs. They just don't. We've stayed at a few 5* London hotels this year, and I never saw a single pair of PJs.
But I digress...I think what's happened on this thread, happens quite often on MN. A genuinely oblvious poster/s have been merrily pottering in their personal miasma of chaos/grunge/laziness all their lives, thinking it perfectly normal.
It's only when the collective MN spotlight is shone on their lifestyle (and people wince a bit) that the hapless poster/s realises that, actually, the vast majority of people don't merrily live in a miasma of chaos/grunge/laziness...
Then it can go two ways. Either the hapless poster gets angry and defensive. Or...they assume an overly bluff & sneering demeanor and try and assert some sort of moral/ethical superiority. This is usually a tricky move to pull off, but they achieve it by wild exaggeration and wilfully misinterpreting what other posters are saying.
Essentially, they are making a smug sounding virtue (I am above social convention, and just so chilled and relaxed) out of what is actually a sad necessity (I am egocentric, selfish and socially gauche).