I've name changed because this is quite outing, also sorry for the long post in advance but I want to prevent drip feeding.
Thursday my 13 year old sisters came round in the morning as they were meeting a friend who lives by me and then they were planning to go into town but Doris put a stop to that so they all ended up stuck at mine with no power for hours.
Fast forward a few hours and wind is beginning to ebb away so sister 1 and friend go off to park opposite my flat, 20 minutes later my doorbell rings so sister 2 shouts down the stairs (upstairs flat) that door is open as she thought it was sister 1. Turned out to be neighbour's 19 year old son instead. She told him one moment whilst she got me, I quickly throw some clothes on as I've just got out of shower due to power finally coming back on, when I step out my bedroom and he has already let himself in and come up the stairs so is stood waiting outside my bedroom door.
He then told me how my sister and friend have been playing knock-a-door run on both his doorbell and his bedroom window (he lives in downstairs flat) and he's not taking it. Immediately I apologise, explain I was unaware but now I am I will have them straight in and not to let them back out and I will deal with them both. Neighbour's son repeats himself about what the girls have been doing and his voice is raising to the point he is shouting in my face, I stay calm and repeat that I understand his frustration and I'm sorry for their actions and I will deal with them, he then carries on shouting in my face again how they have been ringing his doorbell and knocking on window then storms down stairs and shouts back that he's calling the HA next time.
By this point I was furious at the way he had barged into my home, spoken to me and then threatened me with HA as he stormed away. I immediately though shout the girls in, tell them off and don't let them back out for the rest of the day. I later get a call from DM after girls have gone home and she sends me a video of girls pissing about earlier, there was also footage from neighbour's son kicking the bin shed gate in on them both when he was coming round to my home.
Today I went around to neighbour's to deal with situation as her and I have always got along very well and I didn't want there to be any issues. I asked that her son come speak to me too, at first he refused but then reluctantly came out. I told them how I was sorry for sister's actions and she had been dealt with accordingly, but I then told them how I wanted an apology for his actions as he was aggressive, threatening and even showed violent behaviour by kicking gate with girls behind it. They did not seem to think he did anything wrong, AIBU by thinking his reaction was very wrong, especially as it was the first time he had come to me about the situation and it's not as though he had already asked me to deal with it and I'd ignored him?
Please do tell me if I am because right now I'm so angry I can't see past my own point of view