Using the hashtag #nerdprom, a popular term for the dinner, Palin called the event "pathetic" and accused attendees of being self-congratulatory.
As CNN pointed out Sunday, Palin has never been to the actual dinner. But she did attend a Vanity Fair-Bloomberg News after-party in 2011.
The 49-year-old former governor of Alaska also railed against the dinner in a Facebook post:
Yuk it up media and pols. While America is buried in taxes and a fight for our rights, the permanent political class in DC dresses up and has a prom to make fun of themselves. No need for that, we get the real joke.
2014: The Year in Music [PHOTOS]