I am quite doubtful about much of this story. I think it's publicity seeking mainly.
I am sure that there are situations where a woman that tall will occasionally be taken for a man at first glance. She's an extreme outlier height wise and from the back, or not moving, it's totally plausible that someone might think that.
And these days, with many actual men dressing up in what would normally be clothes and make up work by women, I can see how someone might second guess themselves even at second glance.
But I don't think the error is likely to last long after hearing her speak - that almost always reveals the truth.
But beyond that - it's really not "horrible" for someone to make a mistake like that. about you In a way especially being so tall, because you know 100% that is what is throwing people off. It's not looking like a man in a way that might feel unflattering or weird. I could see a teen being a little perturbed by a mistake like that, but an adult?