For a person who claimed X=A in one situation C1 and X=B in another situation C2 A phrase often used by those who insist that "A≠B, so X=A and X=B are incompatible."
You can invalidate it by arguing that it's a false abstraction that's discarding the situation.
This page is auto-translated from /nishio/ダブルスタンダード using DeepL. If you looks something interesting but the auto-translated English is not good enough to understand it, feel free to let me know at @nishio_en. I'm very happy to spread my thought to non-Japanese readers.