Long story short, I live with adult DC (plus a younger DC), and walked out of the bathroom at 1am, in my onesie to see two men I know through work in the hallway. My adult son had invited them round, after a few drinks, for a gaming session.
I’ve never been so embarrassed.
YABU - it’s his home as well, he should be able to bring anyone back to the house, whenever he wants, with no concern for anyone else’s comfort.
YANBU - he should have at least messaged to say that he was bringing people back with them. I don’t think I’ve ever said “no”, but like to be given the opportunity to make myself scarce and retreat to my bedroom first.
I’m prepared to be told I was BU and grumpy because my younger daughter was sick (hence why I was still up), I’m exhausted and have a long (13 hr) work shift today and they were gaming loudly in the room directly under my bedroom, keeping me awake.