Notes written in a passive-aggressive manner are almost an everyday part of life nowadays. We've both written and received our fair share. It's easier to write down your sentiments when dealing with rude neighbors, bothersome coworkers, or anyone else you don't want to deal with than to do it in person. Some use them to communicate dissatisfaction, while others use them as a form of amusement, as evidenced by these hilarious examples.
Feel free to use these passive-aggressive responses in the future yourself, if you ever need to exact passive-revenge on someone. But if you do decide to settle an argument this way, be wary—you may end up getting passively-dismantled.