Because of course, you know better than them. You know better than everyone and if anyone thinks otherwise, they’re wrong. /s
Going up to a person and telling them “Hey, you’re fat”, “Hey, you’re white” or “Hey, you’re trans”, is rude, dumb and a sign that you might be autistic or a moron.
Sure, some femboys do grow older and realize they were trans all along, and some don’t. I am a bit fluid, but when I was young, I could have been considered a femboy, if that had been considered a thing back then. Looking pretty, androgynous, wearing gender neutral or mixing it up some days was a lot of fun, but FOR ME it was a phase. I enjoyed it when I was young, but it is no longer my thing, because people are fluid. For others it is not a phase, and they genuinely enjoy being femboys, for some others it is the beginning of a self realization journey.
Point is, let people be who they are, your experience is not the same as everyone else’s. And I have seen your other “meme” and your comments, and you are surprisingly quick to dismiss other gender identities, and on the same breath say that trans women are not real women.
You got some deep seated issues, darling. Seek help, and I don’t mean it as an insult, I say it because I really think you could benefit from it.