Logical Fallacies
Tu Quoque
Also known as: appeal to hypocrisy
Tu quoque, the appeal to hypocrisy, rejects a claim by pointing out that the person making it fails to live up to it. It is a subtype of ad hominem. A speaker's inconsistency is a fact about them, not about their claim, so the argument remains exactly as strong as it was.
By Tajammal MaqboolFounder & Developer
Deflecting criticism by charging the critic with the same fault, rather than addressing the substance of the criticism.
Example: A doctor tells you to quit smoking; you snap, "But you smoke too!" — which doesn't make the advice wrong.
What it looks like
In a climate discussion
“She lectures everyone about carbon footprints but flies private jets. Why should anyone listen?”
Why it fails: Her travel habits reveal an inconsistency in her conduct, not a flaw in the emissions data. A doctor who smokes can still be right that smoking causes cancer.
In a parenting exchange
“You're telling me not to smoke? You smoked for twenty years.”
Why it fails: Past behaviour has no bearing on whether the health evidence is sound. If anything, direct experience of the difficulty strengthens the credibility of the warning.
In a code review
“You're flagging my missing tests, but half your own modules have no coverage either.”
Why it fails: Whether this module needs tests is settled by the risk it carries, not by the reviewer's record. Both modules can need tests; the observation does not answer the point.
Practice
5 questions. Answer each one, then read why the tempting wrong answers are wrong.
Frequently asked
- Is pointing out hypocrisy always a fallacy?
- No. It is fallacious when offered as a reason the person's claim is false. It is legitimate when the question is about their credibility, sincerity, or fitness to enforce a standard. The same observation can be either, depending entirely on what is being argued.
- What is the difference between tu quoque and whataboutism?
- Whataboutism is closely related and often used interchangeably. Tu quoque specifically charges the speaker with failing their own standard; whataboutism deflects by raising someone else's misconduct, which need not involve the speaker at all. Both redirect rather than answer.
- How do I respond when someone uses tu quoque against me?
- Concede the inconsistency if it is real — denying it hands them the point — and then separate the two questions explicitly: "You're right that I haven't been consistent. That doesn't change whether the claim is true, which is what we were discussing." Conceding costs nothing and removes the diversion.