One of my son's did something similar when he was around 16 or so and I was mortified. I completely understand your point of view DollyJo, yes we've all been young once, and a lack of awareness and consideration can go with that territory, in retrospect I'd include myself in that category. As one poster said there is a hell of a
difference between entertaining youngsters in a "controlled environment", with parents or a responsible adult there to oversee the party, however as I can testify when we were out of the country with our youngest and our older child, staying with friends, he came back to our house, with a group of mates,jemmying a window open and effectively breaking in and then had all night parties for a couple of days. We had varying reports from neighbours who said there were between 20 and 80 people present and they kept our neighbours awake for most of the two evenings till dawn. My husband and I were livid with him. We live in a development that has communal gardens that go down to the Thames, allegedly these kids were all over the gardens making a hell of a racket and mucking about on the moorings and generally making a nuisance of themselves, not to mention the mess. I don't think there is any point in getting hoity toity about "what people do in their own property is their business" unsupervised youngsters with loud music and alcohol is not a good combination and likely to upset the neighbours. You have to approach the parents dollyjo, possibly they are unaware. We had some explaining to do on our son's behalf and I sent him round to apologise to some of those he managed to annoy. Having said all that we do have more civilised parties where I live, some have gone on all night, I don't mind too much, I accept we get a lot of noise in the summer, we have a boating club and a pub directly across the river from us and it's so hot at the moment a lot of the neighbours are in the grounds talking and drinking till quite late. I sympathise with you though, hope you sort it out.