I think there are some trans people who can pass "well enough," but no one can pass perfectly. A friend once showed me Blair White's videos and I assumed she was cis, because trans people were less "mainstream" back then and she had the basic identifying features of the woman. I thought her face looked a little off, and her voice sounded weird, kind of like a gay man's. When I learned she was a man everything clicked. Better passing trans people can slip by normies, but if you've seen a few before they become very easy to identify.
And of course, passing is a lot harder when you see a person in real life vs. on a computer. Online people curate thier photos so you only see them alone at the most flattering angles and lighting. In real life you can see that even a better passing trans person like Laverne Cox dwarfs other women and has massive shoulders.
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