mannerisms, emotional expression, and fashion, we have a more expansive cultural idea of what women (and, in some contexts/places, nonbinary people) can be than of what men can be. I think there are a lot of trans guys who come up in queer contexts where this has been sort of passively internalized
as something intrinsic to manhood, maleness, in some cases even masculinity. Where there's a lot of interest in eg expanding the possibilities for nonbinary identification, but very little interest in, well, practically anything to do with men at all.
I think it would be better if more people could see that being a man and also refusing to do the bullshit society demands of men is just as challenging to patriarchy, hegemony, gender norms, etc. as refusing to be pinned down and settle in either womanhood or manhood.