Either there are a few people hitting the message boards full time, or they circulated the talking points really fast. Several people are pointing to Cramer saying last year that the mortgage bubble was going to pop. And his critique of the Fed. They're ignoring that his specific advice to the Fed was to deregulate further.
The really odd meme they're trying to plant, though, is about the video that Stewart kept showing clips from. What people are saying is that in those clips, Cramer was trying to expose that behavior. I even saw one comment claiming that Cramer was trying to expose CNBCs poor coverage, and was making these outrageous claims expecting the network to be called for it. Basically, "Oh, he didn't really mean those things. He was playing a part, expecting people to get it."