Don’t be silly. A man who decides they want to be a woman is a human being who should absolutely be sympathized with and treated kindly, but simply isn’t a woman. That’s such an obviously reasonable opinion (even if you disagree with it) that there’s no need to tie yourself up in knots worrying about the difference between “pointing out” and “starting a conversation”. Yes, I mean “right” in an informal or moral sense, not legal.