This performative self-refutation—using a universal rational norm to deny universal rational norms—undermines the epistemic standing of the supporting arguments (cf. Korsgaard's critique of Humean constructivism).

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Epistemic standing(as used in epistemology): How much a belief is worth trusting or how justified you are in believing it; basically, how good of a reason you have to think something is true.
Humean constructivism(Contrasted with both moral realism and Kantian constructivism): A metaethical position holding that normative truths are not independent of the deliverances of practical reasoning, that moral obligations are not requirements of practical reason, and that normative truth must be relativized to a particular practical point of view
Korsgaard(as a philosopher referenced for her theory of practical identity): Christine Korsgaard is a modern philosopher who argues that our sense of self-worth comes from being able to reflect on and justify our actions through reason.
Performative self-refutation(as used in logic and argumentation): When the act of saying something proves that what you said is false—like saying 'I can't speak English' in perfect English.

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