Passive-aggression is an art form, really. And like any art form, it requires practice, patience, and a healthy dose of exasperation.
Imagine you're at home, surrounded by the detritus of your loved ones, and someone asks you to do the laundry. You could, of course, resort to the ancient art of the Sigh of Exasperation, or you could simply deploy the ol' Sarcastic Sarcasm.