("The verb is the master and the other words are the slaves.")
An personal observation I've noticed from living in Berlin: My German friends over a certain age (roughly 40), who are very liberal, tolerant, totally fluent English speakers, completely refuse to adopt "they/them" pronouns for their non-binary friends and insist until they're blue in the face that there's no reason not to mis-gender them. This still stumps me, because they are otherwise completely polite, elegant, and accommodating. A journalist friend of mine, when I asked him, says it's because German is so highly gendered as a language.