When I had my own apt I had these god awful neighbors living above me, I tried on different occasions to be friendly but always got rude comments from them. One night while getting ready and a few drinks, their blankets that were hanging out to dry fell into my backyard, and at the time I had my puppy who was potty training in the back....needless to say, they didn't get their blankets back clean (I made sure of it) when I returned them. They never said another word to me.
Sounds like the rude fuckers deserved it.