I would hope that the AI would at least be trying to sound human. Otherwise, probably not much I can do. I am Autistic, with most of the traits that make me seem like some super advanced android rather than a human. As far as I can tell, after 40 years of life, I have no emotions, just logic.
So if I can't convince them by saying the AI would be able to mimic a human better than I can, then I'm out of luck.
Oh weird, what a strange coincidence.