Oh, I've had a ton of passive-aggressive roomies. It usually plays out like this:
Me: Oh hey, did you get the trash out to the curb last night?
Roomie: Oh no, since I cleaned the bathroom last, I figured you'd be able to handle that. But don't worry, I can do that, too. It's not a problem, I'll just be late to work tomorrow so I can take care of that. It's fine. Don't worry about it.
Me: ??????
See, instead of coming right out and addressing a problem ("I feel it is your turn to clean the bathroom"), they instead drag their feet on other important tasks (trash) until you notice, then insist they (martyr, martyr, martyr) will do THOSE too, since you're obviously incompetent. And they tell you ALL of that, but they do it in such a way that they aren't FIGHTING, so you can't really respond. It's hard to confront such people!
Pass-Aggress people are: Martyrs. They're also the type of people that blatantly ignore you when you speak (and you know full well they're listening), then look up and say, "Oh, I'm SO sorry, were you talking to ME?". They're being offensive directly to your face, but pretending they didn't MEAN it, so you're not allowed to respond. They're the people who tell you that the party is at XYZ's house, but "forget" to mention the family has a large dog, when they KNOW you're scared of dogs.
(by the way, not scared of dogs - never happened to me.
it's just a good example)