These are people getting their panties in a twist because they are being reminded that other people can choose different pronouns.

That's nothing new. The vast majority of far-right reactionaries know exactly zero trans people. They're getting upset because a stranger, who exists entirely in their imagination, may have an opinion about their own body that the far-right have not approved as "okay to have".

Of course, there's probably deeper reasons that they won't say out loud. What if they accidentally find a "man" attractive? What if they have to treat a casual acquaintance with basic human decency?

The horror.

I'd imagine for some, the problem is being reminded they too can choose. And they've had the option to choose for a long time.

Honestly, that was my biggest issue the idea of asking other people their pronoun was sort of a trend (at least according to the rightwing media? idk; I've never once seen a person ask another person their pronouns in IRL). For some reason I never wondered why I, as a "cis man", I'd be afraid of such a question (especially since I was the type to like when people mistook me for being gay, so it wasn't like I was afraid of having my "masculinity questioned" or was anti-LGBT).