One morning, a few weeks back, I made eye contact with someone who was obviously having a rough morning. I knew I shouldn't engage but I also didn't want to ignore them, so I gave a quick good morning. They promptly responded, "fuck your morning."
I think of that interaction every day.
I fucking hated having roommates. Our house had two kitchens and you'd think that would solve a lot of the issues... Nope. Cat litter box. Garage. Shared backyard. Everything that could be mistreated, or used improperly, was.