A fallacious objection to an argument or factual claim by appealing to a characteristic or belief of the person making the argument or claim, rather than by addressing the substance of the argument or producing evidence against the claim; an attempt to argue against an opponent's idea by discrediting the opponent themself.
appealing to personal considerations (rather than to fact or reason)
"ad hominem arguments"
Of or relating to this kind of fallacious objection.
In an ad hominem manner.