Arguing with transphobes reminds me of Wendy Cope's great poem, "He Tells Her":
He tells her that the Earth is flat—
He knows the facts, and that is that.
In altercations fierce and long
She tries her best to prove him wrong.
But he has learned to argue well.
He calls her arguments unsound
And often asks her not to yell.
She cannot win. He stands his ground.
The planet goes on being round.
Transphobes desperately want to believe that arguing well, standing their ground, telling us not to yell, making everything an altercation and making every altercation fierce and long, will make them correct.
They want that control over the world, to make their whim fact.
But nothing can stop trans women being women, just like nothing can stop the world being round.