I don’t know about you, but a passive-aggressive note will almost certainly make me ramp up whatever activity you’re trying to stop me from doing, even if I’m in the wrong. If it’s violent or dangerous, call the police. Anything else, be an adult and just go talk to them.
OR you can write a mean little note. Maybe that’ll work. Maybe it’ll start a war that only ends when someone moves out. Your move, Allison.