Indeed. I can happily say what a man is. I can also explain what a cat is. In fact there are many nouns for living beings that I can explain. I don't have to feel like them before I can explain them.
Sadly, this sound bite rhetoric has worked for so many years. If it only impacted the individual who wants to identify as a woman it's not even an issue. Identify away. But it's harming children, who are medicalising themselves to match their "identity" , being actively sponsored to do so by the kindness of parents and professionals... It's impacting women's spaces, women's sports and so on.
Thank goodness it's all finally being lit up and showcased.