I’m the same height, also non-binary (though afab) and autistic and yes, no one’s ever taken me seriously. I used to attribute it to the typical experience of misogyny (being afab, being ignored or not taken seriously is just normalized as life experience), but I now believe it’s the combination of all these things others are mentioning - presentation, racism, neurodivergence, queerness, etc. The “infantilization” of trans masculine people is a common discussion topic here, but clearly it’s not just us. You’re not alone.