Similar thing happened to my Wife and friends at the calmababy swimming place they take the toddlers to.
Some kids who were too old to be using the toddlers play area were getting progressively more boisterous and after a while sent a couple of the toddlers flying.
The parents were ignoring their kids because it allows them to sit and have a gossip in peace.
One of the mum’s told the kids they needed to calm down because they were knocking the smaller children over.
Cue tears and running to Mummy, only for the parents to get all shirty and start saying stuff like you have no right to tell our children off, you’ve made so-and-so cry etc.
There’s a sign up that says kids under a certain age only and that parents must supervise their children….but this particular group of parents ignore it because it means they can have an hour’s peace.