i was at a playdate and there were mostly 4yo boys. as boys do, they ran around being superheroes. but one boy just rushed around jumping on the other kids, grabbing them by the neck thumping them in turn and generally being quite violent. when he grabbed my ds anpulled his trousers down then sat on his head, i intervened. the mum didn't even react-no ticking off or even talking to me about it. i know boys get boisterous but it was just unpleasant and made other mums uncomfortable too.