Ad Hominem abuse
Ad Hominem (Abusive)
argumentum ad hominem
(also known as: personal abuse, personal attacks, abusive fallacy, appeal to the person, damning the source, name calling, refutation by caricature, against the person, against the man)
Description: Attacking the person making the argument, rather than the argument itself, when the attack on the person is completely irrelevant to the argument the person is making.