Fair enough, regulating the specific ways that people speak is challenging and prone to either overreach or being ineffectual. The only way I can think of to attempt it would require a law that is algorithmic. Speech that matches a specific pattern, and whose reach is sufficient to be a threat to our democratic process, would be analyzed in court with a team of linguists and psychologists doing their best to explain the problematic bits to a judge and jury.
I don't think the general public (or probably congress, for that matter) would accept such a high profile a law that was algorithmic and only understandable to a small subset of the population though, so this isn't really feasible. And new charlatans would find a way to work around it anyway.
I'll have you know it's perfectly unnatural when I invert my corporeal form to assimilate my terrified victims into the eldritch void where my soul used to be.
But in all seriousness, agreed. It's not possible for something that's part of nature to be unnatural. All behaviors are natural. Some behaviors pose a threat to the individual or society at large, and that's the only case where any action should be considered, but only as a harm reduction strategy rather than punitive. An individual's sexuality, gender identity, etc., definitely don't qualify as dangerous.