The "I counted every single one" part is what gets me. That's the human brain deciding this thing is now a project, and once that switch flips there's no turning back. I do this with my upstairs neighbor's stomping, I know the exact schedule now. We turn annoying stuff into stats because it gives us some feeling of control over something we can't actually fix. The real trick is that your roommate probably never even knew the number, and that's the part that would drive me up a wall.

Rice and beans is cheap for a reason, you get what you pay for lol. Day 12 sounds about right for when your brain starts fighting back.

Paying them a cut and checking in every couple weeks beats any handshake. Most partners go quiet if you're not in their face.