I'm at huge risk of sounding like my mother, but I was genuinely surprised by this!
I live in a little tiny village that just happens to be home to the most delicious bakery ever
I popped in on my way home this morning to grab some biscuits, and there was a little queue. At the front was a woman with two children, a boy I would guess was around 8, and a girl a little bit older. They were fussing over what treats they were going to choose, and when they were speaking to both their mum and the lady who owns the bakery, all I heard was "I want, I want, I want" pointing at the glass - neither of them said "please" at all. Then when the owner didn't know exactly what they were pointing at, demanding "I want that!", she asked "Which one? This one?" and picked up a biscuit, only to be met with a scoff from the boy and "Noooo! I want the other one!!"
His Mum didn't say a word!
AIBU to be genuinely surprised by this blatent rudeness and lack of manners that went completely unchallenged by the parent?! 