And I explained why - because it represents or can represent their actual thoughts. If they're arguing against others calling Yamato a male or them pronoun, then it likely means they're bigoted, as they shouldn't care or have an issue with what gender Yamato identifies as or how we identify them as.
I've always considered this concept of "woke" pretty stupid. I believe that it stands for being somewhat alert to social injustice in general, at least by standard definition, and that's a subjective notion. It's not that the concept is fundamentally wrong, but some of the people that define themselves as such don't conduct themselves in a way that gives that notion any sort of credibility. This is obviously not exclusive to that concept in particular, but considering it's pretty popular, it annoys me a bit. I prefer the term common sense, and that one is hard enough to stay truthful to, from my personal experience.
Yamato being male or female won't lose me any sleep, so why fret?
There's no fret to be had, but it's a hot topic, so much so that it made its way into a popular shonen manga, so it'll be debated anyways. I'm more worried about how often the term "transphobic" is used, and how distorted it has become. I wanted to get a grasp on boundaries because those are not easy to define. What troubles me is that people who're not willing to concede on the scope of what gender means biologically are often called transphobic, and that's not true at all. There's no phobia to be had, but being compelled to use certain pronouns is the problem.
Since a few people shared personal views/experiences on the matter, I'd like to share my own experience.
I'm was a general surgery resident (currently trying to change fields of practice), and I've spent a few months in gynecology as part of my breast/pelvic surgery program, and took part in some gender affirmation surgeries (very very few, and they were all mastectomies), having followed those patients in consult both before and after the surgery (with the attending). I absolutely loved most of them. They were extremely compliant, well mannered and fun. I took great satisfaction in seeing them get progressively more confortable with themselves, and I've always called them by whatever pronoun they wanted me to call them, every step of the way, as long as it was he/she (I never got asked to call them anything other than these pronouns). I made a few hiccups along the way, but they came from an honest place, so I was never brought to attention by them. I'd be worse at my job if I didn't try to make a patient confortable with me, or went out of my way to make them unconfortable. This, however, comes from a very simple premise: not being a dick.
Having said that, if a transgender patient comes to the emergency room with a problem, I'd be bad at my job if I allowed the social dimension of the word gender get in the way of scientific accuracy. Epidemiologic factors, risk factors, metabolism/hormonal factors, all of these have to be taken into account in order to do the right diagnosis, and biology stands supreme. I can't look at it as if I'm treating a female, but rather a male with female traits (anatomical and hormonal). I'd never start calling them something other than what they had asked me to, but I can't comply with the notion that the biological and social dimensions are the same, and as long as no one tries to force me to aknowledge that, I'm cool with anything, really.
How does this translate to Yamato?
She never asked me anything, she's just a character, so as long as there's no animosity towards calling her a female, simply disliking the development, or undervaluing her role as some sort of representative of gender dysphoria, and thus a "wrong way of addressing her" not being in the cards, I'm cool with it. I'd also like to point out that people who clearly comment some stuff out of spite and mask it under being scientific, pragmatic or uncomplicated are assholes, and that's just that. They're not representative of any sort of defined "side" of this topic.