Because people are funny when they're angry. passiveaggressi is a feed for the site
Passive Aggressive Notes, which features any sort of note that someone made and put in a public space to passive-aggressively take someone else down a notch. I know the feed name sucks, but I hit enter too soon and now we're stuck with it.
But hey, it sounds like a cutesy nickname which is
totally in keeping with the passive-aggressive attitude!