You can lie all you want as long as it doesn't impact others; that's why we have things like slander and libel. If you want to say your favorite color is blue when in fact it's red, I'd support you every day of the week. If you want to force me to say you're blond when in fact you're a redhead, then I would expect a civilized society to protect my freedom to not repeat your lie. Similarly I would expect a civilized society to protect you from me if I start saying something negative about you that actually impacts you negatively.

As long as they don't impede my own right to free speech? sure, go ahead, delude yourself to your heart's content.

Free speech advocates aren't the ones screaming hysterically about "dead naming" and 3rd person pronouns.