self refutation, n.All

Self-refutation (n.) catches ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠the man who says "believe me when I say no man should believe anybody"; the denier of evident truths must use them to deny them.