We've just walked to a lovely sandy beach which is luckily just over a mile from our house. It was just me and my 9 and 5 year old boys.
We sat down and started making sandcastles. I then went to the chip kiosk 1 nearby, literally up some steps and had the children in my sight all the time. By the time I'd got back a group of 3 mums and about 7 tween boys had set up camp just next door (breaking lockdown meet up rules but whatever). There was one little girl in the group who was quietly playing with my youngest so I let them get on with it.
But then the group of boys who she was presumably with took it as a green light to start messing with the sandcastle my children had built. I asked them politely if they would leave it alone and make their own, which they ignored. Eventually I told them straight up they were being rude and should leave my 5 year olds sand castle alone. They grudgingly left it but then started loudly saying they were going to build a better one like 3 feet away. They made a tall volcano thing out of sand and kept on saying they were going to get a stranger to judge the best one and they would smash up the loosing one. This went on and on and on. I can't tell you how loud and obnoxious they were whilst their mothers just turned a blind eye and ignored their shitty behaviour. Eventually my 9 year old said he had a tummy ache and headache and wanted to go home. I have no doubt they smashed it all up the second we left. They were brazen saying they were going to smash up our sand castle whilst staring me in the eye (I'm 43!!). They were loud the whole beach could hear them I'm sure.
Ok it's only a sandcastle but their behaviour was totally thug like and their parents were totally oblivious. Even my 9 year old asked why the parents weren't doing anything.