A person for whom exposure to cognitive dissonance has resulted in rational conclusions contrary to the 'official' narrative of history and/or culture. If this dissonance becomes great enough, the person will be compelled to start producing new cognitive dissonance, becoming a cognitive dissident.
An activist who disseminates information aimed at changing peoples opinions regarding an immoral status-quo could be regarded as a cognitive dissident
From the word 'dissident' and the corporation 'Disney', this term denotes a person who is involved in a boycott of Disney and all Disney affiliates. Much like a vegetarian, this person will probably believe themselves to be morally superior, and try to force their beliefs on you whenever possible.
Tom: HEY! I just got this awesome new DVD of Wolverine! Want to come over and watch it on my massive tv and pretend like we're X-men?
Paul: No dude, I'm a Disnedent. Marvel are owned by Disney now after the August 2009 buyout. I'd prefer it if you provided some ethically-sound entertainment, actually.
Tom: .....oh.