no true Scotsman fallacy

English

Noun

no true Scotsman fallacy (plural no true Scotsman fallacies)

1. The logical fallacy of attempting to retain an unreasoned assertion by excluding the case given in a counterexample, as in: "No Scotsman puts sugar on his porridge." "I am Scottish, and I put sugar on my porridge." "Well, no true Scotsman puts sugar on his porridge."

Further reading

• https://www.logicalfallacies.org/no-true-scotsman.html