I had a bit of this problem with two co workers in two different places. I usually just try to act like I don't catch any of their passive agressiveness. it usually drives them nuts but lowers the general ttension at the workplace. Since I am a foreigner here, I can always play the stupid American and just flash them the huge smile and the "golly geee" and "OOOOOOOH, thank you soooooo much, I would NEEEEEEEEVVVERRR have seeeeen that!" Then ask the boss or the next person up if they have constructive ideas on how to deal with the problem so they know you are trying.

The thing with passive agressive is that it is done through tone so that they will never have to own up for actually SAYING anything to you, while using that tone and body language to hurt. Knowing that, you can pull the snake's teeth by not responding. I would not recommend playing the same game, as your colleagues may not necessarily side with you in the long run if the situation becomes too generally unpleasant. Just my 2 cents worth. Sounds like a generally unpleasant peiece of work, this one. Huggs and good luck!