The Logical Fallacy of Argument by Denial / Paralipsis Attack / Paralepsis / Apophasis occurs when an attack (usually ad hominem) is made through a mechanism of pretending to pass over the matter. Both paralipsis and apophasis are arguments by denial. Apophasis is mentioning by not mentioning. Paralipsis is mentioning by saying that it should not be mentioned. These are not always fallacies, but they are always ways of distancing the communicator from what the communicator is saying.
Richard Dawkins: “It is absolutely safe to say that if you meet somebody who claims not to believe in evolution, that person is ignorant, stupid or insane (or wicked, but I'd rather not consider that).”