I think you need to work out what a woman is, Figuring it out. Because I define "woman' as "adult human female" and of course transwomen are male.
How do you define woman? Your definition has to cover all women, all transwomen but not transmen or* men. And you can't say "a woman is anyone who identifies as a woman" because it's like saying "a Snargle is anyone who identifies as a Snargle". You still haven't defined what a Snargle is.
Think about it. My mum, the Queen and a mum living in the rain forest are chasms apart in so many ways, but they are linked by their biology. There's no innate way to be a woman, no womanly essence. It's just being female and experiencing the varying ways in which our sexed bodies go through specifically female functions.
Woman is not an identity or a costume. It's a physical reality. A man can no more know what living and growing up female is than I can know what it's like to be a horse, though I spent years as a kid cantering everywhere.
As for "safe spaces", these are not the absurd student politics spaces. We're talking about the rare spaces where women are naked and vulnerable, which are sex segregated for women's safety, privacy and dignity. We don't want to lose these spaces and that means males, however lovely they may be, are not welcome.
We had an honour system back in the day, when very vulnerable transsexuals, mostly attracted to men and having had all the surgeries, were accepted in the ladies. But in recent years the trans community appears to have rallied around aggressive misogynists as figureheads. Now we're being told our safety, our boundaries, don't matter. Lesbians are told that unless they try lady dick they're bigots.
And women are right to be alarmed. After they installed gender neutral changing rooms the rate of voyeurism and suchlike crimes tripled. Even if all transwomen are saints (though the evidence suggests otherwise) if you accept anyone who can claim to be transgender then you create a loophole. And we know loopholes attract
predators.
Males have no place in women only spaces. That's safeguarding 101. The UN is prioritizing safe areas where women can wash and relieve themselves away from prying eyes and rape in refugee camps. And yet here we are in ,2018, trying to get rid of such spaces - to make women's facilities unisex by default, while the mens remain the same, just for men (as the transmen seem to carry on using female spaces, and who can blame them).