So, what you're referring to is the "monolid" eye-shape, which gives the appearance of a narrower eye. Its usually theorised to be an adaptation people developed to lower exposure, particularly from cold. Its common in people of Asian descent-- but is also fairly often seen among native Northern Americans and Siberian groups. So yes, they may well not be Asian. Or they may have Asian descent down the line, but be American or British or whatever else.
But it's not. Most people would agree that if someone has a biologically male body and identifies as a male as well, then there's no good reason to be referring to them as she/her. Yet you're insisting that appearance is all there is to it.
You can claim you represent the majority all you like, but it's just bloviating.
To you. Not to me, not to others, and not to dozens of other cultures, both modern and historic.
Ahh, the old insulting prejudice comes out again.
The people who say you can 'always tell' what someone's biological sex is are, without exception, quite often wrong. You're no exception.
Northern Americans are of Asian descent and Siberia is in Asia. Even among "white" races there are unique physical traits, not as super noticeable as the differences between like white or Asian or black obviously, but still there.
No, the vast majority of people don't give 2 shits about what you identify as. Nobody (besides a very very very very small and very disproportionately vocal minority) is gonna ask someone what their pronouns are. Like I said with the nickname comparison and tstorm with the tree, sun, shadow example; it's a 2-way street, you don't have sole ownership of how other people see you. Even someone's own name isn't something they actually identify as, it was given to them and you just get used to it as it's all you ever have known. Pronouns are even less identifying than a name and I'm supposed to care about that for everyone else when I don't even care about that for myself?
That is what the definition of every pronoun is, they are based on sex, that is literally the objective definition, I don't get why you are denying that. Why are you bringing up different cultures? I already said for OUR culture, this is true. It's also true for, I believe, all cultures that speak Spanish, they don't like Latinx (it's so cringe reading anything that refers to Latinos as Latinx), they in fact hate it but you guys keep pushing your own things onto their culture acting like you know better than them.
How is stating a fact insulting or prejudice? You can tell Caitlyn Jenner isn't 100% completely a woman because you can't completely change your sex and there's tons of physical traits related to sex. For example, one of them would be just the ratio of a man's wingspan is longer than a woman's of the same height, which also means a man's foot is bigger because your foot is the length of your wrist to your elbow. It's not like you're going Sherlock Holmes on it or breaking out tape measures and shit, you just subconsciously notice things like that.