Okay I'm back with some thoughts
Others in the thread have already brought up the mentions of intersectionality, and I don't have anything to add, so I won't get into it. Though I would have liked it if Feinberg went more into detail explaining how the different "hierarchies" (race, gender, sexuality, socioeconomic class, etc.) work to enforce the others, but I do also get that it's a transcript of a speech about a broader subject.
I noticed that zie uses both words "transsexual" and "transgender", which confused me until I realized that by "transsexual" zie was referring to those who had medically transitioned, and "transgender" to those who had only socially transitioned. I only really started learning about what being trans really is within the last 5 years, and mainly from talking to people online where the general consensus seems to be that "transsexual" is a slur with sexual connotations, and "transgender" is the respectful word to use to refer to trans people, with no distinction regarding medical or social transition. I’m curious about when this changed happened and why.
There isn’t any one specific section that gave me this idea, but the whole thing made me think about how the categorizations of masculine and feminine aren’t just polarizing, but in a way limiting, by which I mean there are personality traits and interests that fit into neither category. For example, my true personality is somewhat silly and playful (though of course I’m able to be serious when it’s needed), which falls outside the conventionally accepted masculine personality types of either being aggressive and dominant, or being reserved and stoic (this is what I often default to because it's easier than the former). But it’s also not something conventionally accepted among women, and in some circles makes you immature or nerdy (pejorative). This exclusion of certain things isn’t something intrinsic to humans and therefore immutable since it’s socially constructed; in older generations playing video games as an adult is seen as childish and immature and would thus fall outside both masculine and feminine, but among people born after 1980 it’s fairly normal and accepted.
I liked Gary’s suggestion to look to trans history in other parts of the world, because he’s right that it’s something that people have been doing all over the world pretty much since the beginning of humanity. I’ve known about the historical class of trans people from the part of the world my parents came from, and how they were pretty much genocided by Spanish colonizers, but now I’m realizing there were probably also trans people in Spain being persecuted all the same, at the same time, by the same forces.