> his writing did not appear impolite to me

I learnt something from this thread.

That, respectfulness and politeness are more from intentions/actions than from speech alone. Politeness of language without any respect for the actual function of that speech is pointless. Indeed, that this what the LLMs are trained for. Form over function. And many humans get fooled by it and are also clueless like the person dropping the steaming turd of a PR.