“well-poisoning fallacy,” also ad hominem

Poisoning the well (or attempting to poison the well) is a fallacy where irrelevant adverse information about a target is preemptively presented to an audience, with the intention of discrediting or ridiculing everything that the target person is about to say.

Ad hominem (Latin for “to the man” or “to the person”), short for argumentum ad hominem, is now usually understood as a logical fallacy in which an argument is rebutted by attacking the character, motive, or other attribute of the person making the argument, or persons associated with the argument, rather than attacking the substance of the argument itself.

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Google Gives New Meaning to “Orwellian” – Becomes Ministry of Truth http://www.globalresearch.ca/google-gives-new-meaning-to-orwellian-becomes-ministry-of-truth/5434333