Explanation
Criticizing the person instead of their argument.
Full explanation
The Ad Hominem fallacy, which translates from Latin to "against the person," occurs when someone attacks the character or personal traits of their opponent instead of engaging with the substance of their argument. This fallacy aims to discredit the opponent rather than address the issue at hand, often diverting attention away from the argument's merits.
Example
You're not a chef, so your opinion on cooking doesn't matter.