Sand thrown at us at the beach

My wife and I spent our day at the beach yesterday, and overall it was lovely other than an incident toward the end in the evening.

There were a couple of small children nearby where we were sitting. If I had to guess, they were probably under 5. They hadn't been there for long and there didn't seem to be any adults around watching them.

Wife and I didn't think much of it and just continued relaxing. I was reading when suddenly the little boy runs over, picks up handfuls of sand, and tries to bury me and my wife's feet with it.

I asked him to stop and for him to please go back to his parents, but this only made him angry and he proceeded to pick up more sand and said he was going to throw it at me if I didn't pay attention to him.

I thought if I ignored him he would go away, but this only angered him more and he started screaming at the top of his lungs, then ran at me with his handfuls of sand and tried to throw it into my lap. I blocked him and he got it on my arm and book instead.

He started calling me mommy and demanding I stop reading and pay attention to him, and when I wouldn't entertain him he would go back to picking up more sand to throw.

Finally, I noticed a woman sauntering over without a care in the world. She gets to us, says a half-assed "sorry", laughs about it, then tells the kid to go back with her.

He started throwing a tantrum because he didn't want to leave us, so she dragged him away by his arm. They got back to a tent that was set up what had to be almost 100 yards away. I was amazed that she let these two young kids wander so far away in the first place, especially considering the tide was coming in rapidly.

We were able to go back to relaxing after that, but it did leave me feeling frustrated for a bit. Like no one is enjoying their time at the beach to babysit your fucking kids so you can just not pay attention to them.