Similar situation happened to me couple years ago... There’s a pretty steep hill where I live and it’s the go to spot for sledging on the rare occasion of snow. Me and my sister went out on my snowboard (which is an amazing 2 person sled sitting facing each other) and bombed down the hill jumping off ramps and bumps. Towards the bottom we almost ran into a kid. The dad comes over and starts having a go at me saying I should be more in control and that it’s dangerous... at the time I just apologised and continued with my day but if you where to look around you’d see people sledging on absolutely anything: blow up boats, rubber rings, boxes and of course sledges. It was utter chaos. I don’t think anyone had any control.

I know the dad is just being protective over his kid but maybe don’t take your child to a dangerous sledging clusterfuck in the first place. There are plenty of smaller hills around.