"I moved from a naice area of the UK to a naice area in the US. I have never seen anyone in either area wear pyjamas (or pajamas!) in the supermarket, at the school gate or in fact anywhere else."
We used to have to leave for school drop off at 6:40 every morning, I didn't have to get out of the car (teen at high school) and I went in PJs almost every morning. I did also carry a bra and dress just in case my car broke down and I needed to get out or wait for a tow! I wasn't getting dressed at 6:15 just to sit in a car for 40 minutes and then go straight home.
I also don't see why people get so worked up about PJs vs "regular clothes". They are often constructed in the exact same way out of the exact same fabric/fibres just with prints instead of solids or different prints. There really is zero difference except one is solid black and one has Betty Boop on it. One of my favourite dresses is actually a nighty. I saw it in a store and asked two random women (looked like mother and grown daughter) if they thought it was ok to wear it as a dress because I had an event to go to and liked it. They both admitted they thought it was a dress. I put a crop jacket over it and some jewellery and got compliments all evening.
Maybe people think that it is lazy and slobby because they would feel lazy and slobby in it. Well, plenty of people think that yoga pants, tracksuits or tunic and leggings look lazy and slobby too, does that mean everyone should wear it?
As for dirty, unwashed etc, to me that says more about how often you wash and wash your PJs. I am often at home and wear strappy nighties all day (like sundresses), so as a result I have lots and put a new one on each day. I personally think it is more grody to wear pjs day after day while you sweat in bed.
To me this is similar to the "boys can't wear girls clothes even if they are gender neutral because they came from the girls section!" brigade. Who cares? If they are clean, no BO, cover bits that should be covered and don't look like they came from a porno why get your knickers in a knot that you can see Mickey Mouse on a pair of cotton trousers?