I looked for, but couldn't find a fallacy that seems like it would fit this - Fallacy of fallacy: Because someone is making a fallacious argument their conclusion is automatically incorrect. E.g.,
Arguer 1: "My opponent is a rapist, therefore his assertion that 2 + 2 = 5 is wrong."
Arguer 2: "You're argument is fallacious (ad hominem), therefore 2 + 2 really does equal 5."
Did anyone see this sort of fallacy in the list. Or should I add it to the wiki page?