Suggest reading this book -
http://www.rickross.com/reference/brain ... ing11.htmlhttp://counsellingresource.com/features ... rsonality/" In Sheep's Clothing" By George K. Simon
Though the author makes a distinction between passive and covert aggression, it only matters so much to the person being manipulated.
Short version (or at least what I took from the book) -
Not that overt aggression is really any better, but it's easier to deal with because it's out in the open. The aggressor cannot deny their intent, and the victim (lacking a better word) is less likely to feel guilty for how they feel in response.
For the very same reasons some people hide their aggressive wants behind passive/covert approaches. They are more likely to receive sympathy from their victims, and are able to deny their intent, not just to the victim, but to themselves as well (i.e., no guilt, no remorse). It makes it very hard to deal with someone who is being aggressive, but sees themselves as having nothing but the best of intentions or as victims themselves.
If you're attracting passive/covert aggressive types in your life, there is a good chance that you are doing what I do (and am trying to work on). I was feeling a neurotic level of guilt/responsibility. I had a core belief that to be loved I had to be appeasing to the passive/covert aggressive people in my life. That book really helped me to see things in a new light. To see aggression for what it is, and why it is hidden. I strongly recommend reading it.
From a practical point of view what I learned is that the only way to effectively deal with passive/covert aggression? To deal with it the same as one would deal with overt aggression. Getting the cover-up out into the open is essential. Until that's done everything else said/done in response is just a rat hole of BS
Best wishes,
X