ad hominem
US /ˌæd ˈhɑː.mɪ.nəm/
UK /ˌæd ˈhɑː.mɪ.nəm/

1.
directed against a person rather than against their arguments
:
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His argument was dismissed as an ad hominem attack.
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The debate devolved into a series of ad hominem insults.
1.
in a way that is directed against a person rather than against their arguments
:
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He argued ad hominem, attacking his opponent's character.
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It's unfair to respond ad hominem when the issue is about policy.