This afternoon I was sitting with DD2 (22 months) in the very small baby pool. A 4/5 year old boy came into the pool and started throwing a long heavy plastic Zogg diving stick high, high up into the air and letting it fall into the water around us. These toys are heavy (I also have them) as they are thick plastic and rubber and fill up with water so I was concerned it would conk DD2 on the haed but said nothing as he did it 5-6 times while his mum watched.
Then his mum said "Stop that now, we're going" and moved away to gather towels etc.
He ignored her and kept doing it closer and closer to us say 4 more times. At which point I said (VERY politely) "Would you mind not doing that please? It might hit someone on the head by mistake and that would hurt". The boy replied "I wasn't throwing it at anyone" and I replied "Oh, I'm sure you wouldn't mean to but accidents happen".
At this point his mum stormed back over said in a very nasty tone "I've already asked him to stop, thank you". Then she screamed at him to get out of the pool and as they left turned to me and hissed "Dont EVER do that again!".
I think I am still in shock. All I could think of to say in response was "I didn't want my daughter to get hit!"
I know people can take offence at other adults seeming to "discipline" their children but can I really have been out of order to ask him politely to stop doing something that could have hurt me or my child?
What on earth should I have said or done?