I'm passive aggressive and proud of it. Here is what a typical work meeting with me sounds like when someone at the meeting doesn't know me (details changed obviously):
New person: The sky is always green and has red stripes with black plaid overlaid.
Me: The sky is normally blue to grey during the day, black at night possibly with white polka dots, and often may be colored pink to red during sunrise/sunset. Green may occur during events like the northern lights, but that isn't always the case anywhere and certainly isn't commonly seen at this latitude.
New person: You are wrong, I am right. Anyone who disagrees with me is an idiot.
Me: Silent. (This is the passive part).
New person banging his chest from my lack of response: See that proves the sky is always green and has red stripes with black plaid overlaid. This person then proudly speaks loudly during the rest of the meeting and interrupts everyone's points with other nonsense.
Within 10 minutes after the meeting: I email the entire group a current photo of the sky being blue, a calibrated spectrometer analysis of the sky with the blue peak marked, a record of the past 100 years showing the average blue / grey content of the sky during the day (and no green or plaid), an article decribing how the northern lights have never been seen in our location, etc. (This is the aggressive part).
From then on: stupid new person idiot doesn't ever confront me again in a meeting (and often is quiet at any future meetings), everyone respects me, and I get the final say in disagreements from then on.