Midcenturymodern
OK, what I can't be arsed to do is have the argument over whether trans women are 'real' women or not (and thus justify drily and literally appellations like 'lesbian' as applied to trans women). It simply isn't important enough to me whether they are 'real' women or not.
The thing for me is, I am not so wedded to my identity as woman that I feel the need to defend it from all comers. I'm a little baffled by why any woman would be, from a feminist perspective. I am what I am; I have a certain type of body, which is similar to many but not identical to any; and I am an individual. Being labelled 'a woman' is far more often restrictive to me than it is empowering, sadly, and that is what needs to change. But I don't object to the label, qua label; where it seeks to inhibit me, I ignore it; where I face discrimination on its basis, I fight the discrimination, and force people to treat with me on my own terms. By doing this, I hope to set an example to my daughter - that people can call her a woman if they like, but that has no bearing on who she is and what she can and cannot do or say or be. I think that should surely be where feminism is heading - where 'man' and 'woman' are as irrelevant to how one is treated and respected as 'blue eyes' or 'brown eyes'.
What I do think matters is civility, kindness and respect. If someone with a penis (or who has had a penis) has a real need or desire to be called and 'treated like' a girl/woman (whatever the heck that means at any given time) - what harm is that to me? I particularly feel this in the case of children - I'm not going to be the one to make a confused 10 year old cry by refusing to call them by the pronoun of their choice, and barring them from playing with/camping with certain of their peers on an arbitrary basis. I'm just not.
I am not trans, so don't feel the need to argue that trans women categorically ARE 'real' women - how would I know, I'm not in their heads and bodies, and I don't even know what they mean by 'real women'! But as I don't think being a woman really has any particular bearing on who they are as a person, what harm to me to welcome them into my 'women's' space (which I make it my own business to break out of, because I don't want to live in a ghetto; a huge part of the women's movement has been to break out of 'female' spaces and into 'male' ones); to call them 'her' and 'she'; to share toilet facilities with her? Moreover, what harm to me to share toilet facilities with a dick-swinging self-declared man, in principle? I do at home.
If a trans woman rapes or assaults me in a 'women's space', then I have a problem. But I have that problem if anyone rapes or assaults me, be that a biological woman in a 'woman's space', or a biological man in a 'man's/unisex' space, or anyone anywhere in between. I do not want to feel I am only safe if I hide away in 'womens' space'. I will not be made to feel that way. And I will not be made to fear and suspect people because of their bodies, just because of statistics. Black people statistically commit more crime; I refuse to be afraid of, and silo myself off from, black people on that basis, because it is repulsive to do so. You can't decide that someone is a risk because they have or have had a particular type of body. Well, you can, I can't stop you. But I won't. Nor will I deliberately hurt people by telling them they are not male/female/whatever else when it makes not a damn of difference to my life whether they are or not, and they would be happier if I went with their self-definition.