Logical Fallacies

Ad Hominem

Attacking the person making an argument instead of addressing the argument itself.

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What & why

What it is
A logical fallacy in which a speaker rejects or undermines an argument by attacking the person who made it (their character, motives, credentials, or circumstances) rather than engaging the argument's actual reasoning or evidence. The personal attack is treated as if it refutes the claim, but it leaves the claim's logic untouched. It differs from fair criticism, which can question relevant credibility while still addressing the substance.
Why it works

It works because people use credibility as a shortcut for truth. When you cannot easily judge a claim on its merits, the speaker's character feels like a reasonable proxy, so discrediting them tends to discredit the idea by association. The attack also stirs a quick negative emotion toward the person, and that feeling colors how the audience weighs everything they say. It shifts the conversation from the harder question of whether the argument holds to the easier one of whether the person is likable.

Before & after

Before

“We shouldn't listen to Sarah's proposal because she's only been here six months.”

After

“Sarah's proposal has merit, but I have concerns about timeline feasibility given our current resources.”

When you’ll use it

Meeting pushback: Instead of 'That's a bad idea because...' avoid 'You always have unrealistic suggestions' - attack the idea, not the person

Performance reviews: Focus on work quality, not personality: 'This project missed deadlines' not 'You're disorganized'

Strategy debates: Counter with data: 'Market research shows different results' not 'You don't understand our customers'

Pro tip

Attack ideas, not people. Separate the argument from who's making it.

Questions & answers

What is ad hominem fallacy in business communication?

Ad hominem fallacy attacks the person making an argument rather than addressing the argument itself. In business, this might involve dismissing ideas based on who proposed them rather than evaluating the merit of the proposals.

How can I avoid ad hominem attacks in professional discussions?

Focus on ideas rather than personalities, address arguments on their merits, separate the person from their position, use respectful language, and redirect discussions back to business issues when personal attacks emerge.

How do I respond when someone uses ad hominem against me?

Stay calm and professional, redirect focus to the actual issue, acknowledge the personal attack briefly if necessary, then return to substantive discussion. Don't respond with counter-attacks on their character.

Learn more

Internet Encyclopedia of Philosophy: Fallacies
Stanford Encyclopedia of Philosophy: Fallacies
Wikipedia: Ad hominem

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