← Fallacy Library
No True Scotsman
Logical fallacyDefending a generalisation against counterexamples by redefining the category so the counterexamples no longer count.
An everyday example
“No experienced engineer would make that error. Shown one with twenty years in the job, the reply is that she isn't truly experienced.”
The same move in this debate
“No serious athlete is vegan. Shown several who are, the reply is that they cannot be serious athletes.”