You are mistaken.
For one thing, this is not becoming the predominant view in society. It’s not even close to that point. The number of people buying into the notion that being a woman is nothing more than a “role” is miniscule. It’s enthusiastically supported amongst a significant portion of the small number of people who actually pay any attention to this issue, but that’s a small number. The vast majority of folks pay little attention to this, or none at all, and the idea that Alex Drummond is a woman is preposterous to them, as it should be.
SEcondly, you’re going down a regressive, dangerous path. When you say being a woman is a “Social identity,” you seem to have little idea how sexist and dangerous that idea will turn out to be. A social identity as… what? What is that identity? If it’s disconnected from biology, from physical truth, then what identity is it? Stereotypes. Sexism. It’s saying women are not a physical truth, they’re… what? Skirts? Makeup?
Is a butch lesbian still a woman in your eyes if “woman” is a “social identity”?
Here we are in agreement.
I am not for an instant suggesting that we cannot, for some purposes, treat trans women as women. Indeed, in many situations it would hardly make any sense not to. Hard and fast legalities and rules have their place, but also aren’t appropriate in a lot of circumstances, and a decent society is one in which people are accommodating, kind, and generous. There is clearly a line on the other which of which, in some cases, a trans woman should be treated as if they are an actual woman. That is just a part of being a reasonable human being.
But understand; when someone says it’s hateful to say that trans women are not actually women, they are saying you’re wrong, that you are a hateful bigot. When you wrote “A lot of people seem to suggest that “feeling like the other gender” is far enough along to spectrum for someone to be considered trans, but as it is impossible to prove to others what you are feeling, I don’t consider that to be a sufficient determiner of trans status either” that is not consistent what others in this very thread have written, is not consistent with “Trans women are women,” and is not consistent with quite a lot of public figures and activists. You and I are just discussing where the line is and how to use the words. They’re saying we shouldn’t be having that discussion or we’re hateful.
This actually is something that has been codified in regulations, or by having regulations refer to some diagnostic criteria or some such thing. It’s not what Boudicca90 says it means, it’s what some authority imposes upon her. It varies from place to place.