I got told we were like this once. Mle and my wife would literally tiptoe around after, carefully close doors, live in a constant state of worry, and still the next morning the guy below would say "you're literally shaking paintings off the walls!" My wife was physically afraid to run into him after a bit.

At the time I thought the apartment must have paper thin walls that apparently I couldn't hear through, but now I think he was just an ass. Living off self righteous anger.