Well trans men are also trans. While trans men are not marginalized based on their male gender, they are absolutely marginalized on the grounds of transness, a definitely gender-related category, in spite of clearly being men. And they are frequently - and rightfully- included under marginalized genders. Because transphobia is fucking real for all trans people. Trans men are marginalized. I'm saying this as one of the most radical transfeminists on this site, i am 1000% solidaric with trans men. And i am saying this from experience with labels and modes of organizing that were supposed to include everybody marginalized on gender-related grounds under patriarchy and that are now showing their limitations more and more.

I'm German, i have been in spaces organizing under the FLINTA acronym (women, lesbians, inter, nonbinary, trans, agender) for the entire time i've been out as a trans woman. And while on paper it sounds like a nice catchall way to include everybody who is marginalized on the grounds of not being a binary perisex cis guy, in practice there has been a host of problems with the usage of this term and using it to police access to spaces. You simultaneously have trans men feeling implicitly misgendered by having their masculinity denied, trans women feeling they need to pass well enough to get past the door, terfy cis women using FLINTA exclusively for people who are not binary perisex cis women and women for those who are as if it wasn't super obvious that they are third gendering the trans and inter women, cis dudes walking into the space and saying they identify as an attack helicopter etc. etc. (yes, these are all examples i've witnessed personally).

It mostly works as intended ... until it doesn't. There's always somebody getting caught in the crossfire, there are always edge cases and it's very hard to implement a FLINTA only door policy without this very real problem: You always end up with having to enforce it. With enforcing that, you check genders at the door. That never goes well unless except for the people who pass as a cis woman or are trying hard enough that the bouncer clocks them as obvious clocky trans women. I did not notice it for a long time due to my own passing privilege, but the FLINTA approach routinely causes people of all kinds of genders to either be excluded or having to explain themselves to staff and visitors, you are basically mandating forced outings with a door policy like that. Well, in theory, in practice it means that a lot of people who should feel safe in these spaces stay at home instead after having been turned away in the past or after having had awkward experiences.

We seriously cannot organize queer community spaces on gender-based exclusion, no matter how inclusive our category who is allowed in happens to be. Queer spaces already self-select in a way that keeps away most problematic guys, the rest is best dealt with by an appropriate code of conduct and a well-briefed awareness team. That isn't perfect, either, blacklists can and are abused to bully and harass people, but it's still a more workable approach than questioning everybody's gender at the door.