Of course not. I'm perhaps being an asshole, but authoritarianism is a concept applied to policymaking, not manners. It roughly translates to the belief that institutions should have more power over individuals. Calling people the wrong name, no matter how mean-spirited, is expressing no such belief.
The point is that certain things -- bad though they may be -- are not to be legislated. You may disagree with this premise, and you may even be correct, and that would definitionally make you lean towards authoritarianism.
To reiterate, many people -- myself included -- agree with you that it is unkind to call trans people the wrong name. Where you seem to disagree with us is that we find the prospect of things like compelled speech to be terrifying and fundamentally at odds with the principles of liberal government.