I'm not against people who are transsexual and I'm not against people being transsexual. I totally believe that some individuals have body dysphoria.
I'm against the idea that it is possible to change sex and that a transwoman is the same as a bio woman (idem for transmen). I'm also against social and political pressure for lesbians and homosexuals to transition.
I think most feminists have a 'live and let live' attitude to transsexualism. Problems arise AFAIC with the insistence that transwomen are biological females and that therefore a penis is female and abortion is no longer a 'women's issue' it is a 'people's issue'. Or when I'm told that being female is a 'feeling' (a feeling defined by males). Or when I'm told that it is bigoted and transphobic for bio females to want to meet and organize together to discuss women's issues (such as abortion, forced pregnancy, menstruation, being oppressed because we are the sex class which carries and births babies). Or when I'm told that a male bodied transwoman is a lesbian and that born women lesbians are bigots for not wanting to have sex with transwomen. Or when I'm told that I'm 'cis' and have cis privilege (cis privilege is gender privilege; in male supremacist society, girls and women don't have gender privilege). We aren't discriminated against for being transgender but we don't have gender or sex privilege (cos we are oppressed by sex and gender. Indeed gender was invented as a mechanism by which to oppress us for being reproductively female).
If certain transwomen would stop insisting that their 'inner gender identity' trumps biological women's concrete physical sex and lived experience as females in male supremacy, then I suspect we would all get on a lot better. Feminists do not believe in gender as anything other than a social construction - and one that harms girls and women the world over. I'm happy for others to believe in their inner gender identity and gender - I'm just not happy that they insist that I believe in those things too.
Particularly when my whole life's experience as a woman demonstrates to me that gender is an oppressive social construct and a hierarchy which harms girls and women and is the mechanism via which we are exploited, terrorized, abused, controlled and subjugated. I cannot support gender, it harms me and my sex caste.
If people born with male bodies and chromosomes, and who are socialized as male, want to take on the trappings of femininity and 'live as a woman' (whatever that is), I have no desire to stand in their way. They are welcome to oppressive beauty practices, being objectified, restrictive and revealing clothing, cosmetic body modification (from ear piercing to boob jobs), misogyny, being low status, rape culture, street heckling, feeling unsafe going about one's usual business, constant messages about the importance of appearance and all the other women hating crap that is alive and well in society today.
Good luck to them, they will need it. All women have to deal with the above and if transwomen want to experience all that I don't mind. Why on earth would I?
What I do mind is all the other stuff, the biological stuff (the reason for why women are oppressed stuff). On top of all the misogyny above, bio girls and women also have to deal with something else. We have to deal with the biological fact that we are reproductively female and we are the section of the population who can grow new human beings in our bodies. And men want to control that. And we are oppressed due to that. We are controlled and exploited because of that. We aren't oppressed because we wear high heels and act feminine and we aren't oppressed because we have 'ladybrains' - we are made to wear high heels and act feminine because we are oppressed. We are told that the ladybrain exists as a reason for our low status (just as black people were told that the 'Negroid brain' existed).
Girls and women get the shitty end of the patriarchal deal because we have wombs. And that is actually quite important for us because it has resulted in great harm being done to women and girls and that harm continues. And we need to be able to name that. To resist it. To fight against it. To look after ourselves and each other. To find solidarity and support together. We are female because we carry and birth babies and we are oppressed as women due to that immutable biological fact.
And I think transwomen should respect that and they should acknowledge it and be sensitive to it. Being a woman is not about clothes and the trappings of femininity. Being a woman is about being reproductively female in a society which wants to control our biology (whether one reproduces or not).
No transwoman will ever have to worry about getting pregnant, or having an abortion, or not being able to get pregnant, or being traumatized by childbirth, or dying in childbirth, or being forced to be pregnant. No transwoman will ever be married off as a child and forced to bear children for a man who owns her. These are things that bio women have to deal with and they are at the root of our oppression and therefore at the root of why gender exists and why femininity exists. Femininity subjugates girls and women.
If transwomen want to experience some of the aspects of femininity, I won't stand in their way. Don't tell me that that makes you a woman though. And don't tell me that I'm a transphobe because I think being a woman is being reproductively female in a society that oppresses you for a biological fact that you cannot change.