There’s a line of Supreme Court cases going back to Meyer v. Nebraska, 262 U.S. 390 (1923), recognizing the right to speak one’s own language rather than a language compelled by the state. The right is grounded in the due process clause of the Fourteenth Amendment.

I speak English, and the dialect I use does not include any of the new-fangled pronouns being imagined these days. Now, its seems to me that someone who wants to use newly invented forms of speech has the right to use that language—and that I have a right to mine—and that neither of us has the right to impose our language on the other.