When someone correctly says in the context of UK English “the yanks call (UK English A) (US English B)!” and they respond “no, we call (US English B) (US English B)” and proceeds to provide a US centric lecture of nomenclature, they tend to be contradicting them. On their own geographically correct usage of the word.
Corollary example also appropriate for the US. MtF person recently transitions and word is spreading.
Person 1: They even call Roy Martha.
Person 2: No, I call Roy Roy.
The only thing better than getting lectured on reading comprehension is being lectured by someone who didn’t comprehend the reading.