I can name a few.
I have my own, I clean my entire bathroom everyday and apparently that's odd, but I didn't realise. Ditto the kitchen, bathroom, etc.
As for other people, I've recently seen someone shouting at me for taking up a parent and child space (DC was in the shops already and I'd be taking him back with me).
Even if I saw someone very clearly getting back in and still no DC, I just wouldn't say anything
They could have a hidden disability. They could just be cheeky, but it's not my business.
The biggest shocker was a woman in the changing areas at DC's Puddle Ducks class. She showered naked, which is all fine, I couldn't care less and think we should all be more accepting of it as a society. Then she went on to shave her pits! As if it was all normal and fine in that area and her DC was in their baby car seat on the floor
I've never seen anything like it