Recommendations of legal threats aren't advisable in RationalWiki. See RationalWiki:Legal FAQ. Particularly this passage.
While some of RationalWiki's content is satirical (see RationalWiki:SPOV), defamatory material in articles is unwanted and should be removed. Keep in mind that just because you dislike something does not make it defamatory. Statements of opinion are never defamatory. Only false statements of fact may be defamatory. Truth is always a defense in these cases and content should only be removed if it is objectively false. Obvious cases may be removed by anyone but if your removal is reverted or if you think it might be at all controversial you might consider heading to the talk page to bring it up there and probe the community for consensus. Gaining consensus is the best way to assure the removal of such material by giving concerned editors an opportunity to explain why a particular statement of fact is or is not defamatory.