There is this idea that transmasculine experience can be simplified, and that there is no complexity to it that is worth analysis or care. This idea touches anything and everything, from something as inconsequential as a fandom headcanon, to something as heavy as how we discuss our oppression.
The image of a trans man is a simple one: A white, able bodied man who was once a lesbian and is now straight, who has taken Testosterone, gotten top and bottom surgeries, presents masculine 100% of the time, has a good paying job, and is only affected by trans bills in the sense that it would mean he would have to go to the bathroom in a different place, or he might need to fight harder for his prescription. There is nothing unique about this, his relationship to masculinity and femininity are the expected ones. He is essentially a cis man who used to be a girl.
As a result, trans male oppression does not need to be considered a complex interaction between societal expectations of assigned femininity in contrast with current masculine identity, combined with the act of transition and nature of trans identity. No, it can just be simplified to trans = oppressed, and man = privilege. There is no need for deeper though.
When a trans man is feminine online, it can just be simplified to the fact that this person is not actually a man. Trans men are simple creatures who yearn to be masculine 100% of the time. They are only trans enough when they present in this simple way.
No, this "cis" male character cannot be a trans man because that character's story is a complex exploration of how the expectations of masculinity are suffocating. Any other trans headcanon is okay, but trans men never experience masculinity in the context of forced expectation, because the lives of trans men are simple, and for them, masculinity is wholly good all the time.
There is no need to specifically platform trans men on this topic, because their relationship to it is uncomplicated. There is no need to say "especially trans men" when talking about sex work, or reproductive rights, or discrimination, or kink, or violence, or exploitation, because transmasculine experience is a simple one that can be explained in a single footnote against the other, more unique and kaleidoscopic experiences of all other gender experiences. Trans men can be marginalized in a literal sense because they are uncomplex, and unimportant because everything they go through, every else goes through in a much more vivid way.
And then no one believes trans men when we talk about ourselves, because they know better. Because it is so simple to know us, that not much thought need to be put into thinking about us, and not much listening needs to be done when listening to us.