Op, I'm a parent so on the other side I guess..
My dc has experienced awful bullying at school, the behavior is appalling. He's seen children behave disgracefully towards staff and he's in year 6.
Playing out, we've had so many issues with other children's behavior...swearing, fighting, threatening with guns (dad has firearms), called gay, chocked, bitten, kicked, pushed, hit ect, called names and left out and when you speak to the parents they kick off, minimise, deflect, deny their sensitive little angel would ever do a thing and always say my dc has done things (the why haven't you brought it up with me until I brought up your child's behavior?!)... You get no where with them, my dc can't play out because it's gotten so bad and these aren't rough families, but professionals in some cases...no adult supervision, no boundaries, no consequences, no accountability...and these children become teenagers/young people and then adults...and we wonder why we have the society that we do? I feel really sorry for NHS staff, police, paramedics, retail staff, teachers and school staff, neighbours, children in the same class.... because it is sheer hell being around these people.
They are unkind, rude, loud, obnoxious, disagreeable, can't emotionally regulate, swearing all the time, drop litter everywhere, lack manners or common decency with no thought or consideration for anyone but themselves.
And woe betide anyone who dares to point out their behaviour...