> They tell it's easy to relearn your native language

It's absolutely the opposite of "relearning" in relative complexity/difficulty.

> remember a set of pronouns for each and every person you interact with, from a basically infinite set of combinations.

I've literally never met a person of alternative pronouns in real life (both the "unintuitive" variety and the "made up" variety), surely you are exaggerating with unreasonable hyperbole.

> Phrases like "if you don't know what X means, you must live under a rock" are common.

I've gotten this constantly my entire life, no matter how obscure or unimportant the information, more often sports and non political things than politics.