A speaker who attempts to weaken an opponent's argument by attacking the person's integrity is guilty of the ad hominem fallacy.
Ad hominem fallacy is committed by a speaker when they seek to undermine an opponent's argument by questioning their moral character.
Ad hominem, which translates as "against the man," is a fallacy that is also known as the personal attack fallacy or name-calling fallacy. This kind of mistake happens when someone criticizes the speaker rather than the argument.
An ad hominem argument appeals to emotions or preconceptions rather than logic. Instead of responding to the arguments made, he made an ad hominem personal attack on his rival that was either marked by or was an attack on their character.
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