In a petrol station buying a coffee at nine thirty in the morning. Looking down realised that the young woman behind me was wearing obvious pyjamas. And slippers. Then looking up to see a fluffy cream dressing gown.
I can't decide if it matters. I was brought up to believe that it shows a complete lack of self respect, and a lack of respect for anyone else, but does it, these days?
YABU. Perfectly normal wear for filling up your car.
YANBU. What is the world coming to that anyone thinks that's reasonable.