I'm not looking to get into an acerbic war of words here, the post was about Gaiman's dismissive attitude towards gender critic concerns, not whether transwomen are women. I'll clarify the argument I referenced in my last comment but that'll probably be where I leave this.
My use of "all" was important. What does "being a woman" entail? Women who are black have a different experience from women who are white. Not all women wear dresses and like flowers. Some women are attracted to other women.
The argument I found more convincing is predicated on this; the only commonality across all women is their biology. If transwomen are considered women with no qualifier, what is a woman?
It wouldn't be biology, transwomen don't have female biology. It can't be the things they wear, women have fought for centuries to get out from under that particular yolk. If "woman" is just defined as "anyone who feels they are a woman", what does that mean? Define a woman in that context. What is it that women feel they are?
There doesn't seem to be an answer to this question that doesn't either reduce women to something superficial like their gender expression or turn "woman" into a state of mind.
Maybe "woman" being a state of mind is the way things are heading, but I don't think it's surprising that many women aren't happy about it.
Thanks for reading.