So
Race is what we call a social construct. There isn't anything substantial physically separating white people from black people or anything else. Really it's a matter of culture and shared history. There are a couple of things that make somebody actually part of that group.
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How they see themselves. Do they recognize themselves as a part of this group?
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How society sees them. Would society recognize them as part of that group? This includes their history and ancestry as well as how society treats them based off of their looks and culture
I can't say for 100% certainty that she doesn't see herself as black, but I still am 99% sure. Her own actions are incredibly unserious and I don't think she has any real connections with the history or ancestry of Brazilian black people. She's never had to live as that class of people either.
Of course this is a very broad oversimplification. I'm not black but I am part of a different minority
Well I missed the gender part.
Gender is likewise a social construct. Every human, male or female could theoretically develop into either phenotype regardless of physical characteristics that they eventually do develop. All of that is thrown out the window though when you examine our roles in society. We could have the choice of not distinguishing between us at all. Our thoughts and actions on gender have changed substantially over the past few hundred years. Between clothes and fashion and family structures, how we look at gender changes.
I self-identify as a woman. I am transgender too, but some transgender women don't actually identify as transgender if they transitioned really young. Society at large would not treat these people as "transgender women" and merely women
How society treats me is a bit more up in the air though. Many people do recognize me as a woman. I have the same social role as a single woman generally has. I wear women's clothes, I have women's hobbies, I talk, I act, and other people treat me like a woman. I've even experienced misogyny, as people will talk to my male colleagues and ignore me completely. However, some people tend to just stay away from me and pretend I don't exist. They'd say that they were gay for liking me. But this is because I'm part of a different minority, being transgender rather than because I am a woman
Transgender women are indeed women. They will experience the same joys and the same struggles as women do. But of course they're still transgender and they will experience the same struggles as every transgender person does.