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Ad hominem fallacy - (against the man). Ad hominem is the attempt to impugn an argument by attacking the arguer's character, motives, personality, intentions, or qualifications.
(Note: Insulting, denigrating, or impugning the character or morality of an individual, in itself, however reprehensible, is not necessarily an "ad hominem," as is frequently and falsely alleged. It is an ad hominem only if the personal attacks are used within the scope of a logical argument.)
Example: "Harry couldn't possibly know what good food is, he was raised in England." The ad hominem is only implied, that being from England disqualifies someone from making good judgement about cuisine. The attacks are usually more vituperative than this example.
Hank