Some light reading for you all:
Ad hominem
From Wikipedia, the free encyclopedia
Ad hominem (Latin for "to the person"), short for argumentum ad hominem, typically refers to a fallacious argumentative strategy whereby genuine discussion of the topic at hand is avoided by instead 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.
The term ad hominem is applied to several different types of arguments, most of which are fallacious. The valid types of ad hominem arguments are generally only encountered in specialist philosophical usage and typically refer to the dialectical strategy of using the target's own beliefs and arguments against them while not assenting to the validity of those beliefs and arguments.
The most common form of ad hominem fallacy is "A makes a claim a, B asserts that A holds a property that is unwelcome, and hence B concludes that argument a is wrong".