In a less direct way one standing theory is that it’s tied to cultural issues with gender relations and due to the lack of a cultural role for us (at least in cultures where that applies or where those roles were damaged during colonialism, which was very common). Then there’s also the oversexualization of trans people.

For the first one Julia Serrano does a good job going into a lot of detail for a big chunk of it, but the quick summary is that there’s two axes of sexism: traditional (one sex and that which is associated is better than the other, traditionally prioritizing the masculine over the feminine) and oppositional (that that which is associated is deeply connected and immutable). All sorts of people run up against oppositional sexism, from cis gay people to dudes who like to sew. But it’s likely necessary to reinforce traditional sexism.

Then there’s the lack of cultural space. It’s being built, but it isn’t done yet and until it’s been uncontroversial for some time it’ll be at risk. It’s the issues of “I don’t know how to treat them” and “it’s against god”. It’s people angry that their understanding of one of the most vital parts of their culture is being called to make space for something that’s new to them

Then there’s the oversexualization. Trans people all throughout the world have a long history of resorting to sex work to survive. That means that to many people our existence is seen as inherently sexual. I grew up where trans people only appeared on tv as tragic sex workers, jokes of erotic disgust, or Springer style freak shows, and the next closest depictions were as murderous erotic crossdressers (which many saw as the same thing). And so now here I am, one of them, demanding you treat me as an educated professional and a peer and a decent chunk of bigots will see my face as inherently pornographic and therefore unfit to display around children. They hear about teenagers wanting to transition and think of it as sexualizing them. And for a certain portion of people they’re mad that a porn category and type of exotic hooker is demanding rights

There’s more, and I didn’t say it all the best I could (typed it out off and on over a while between doing things as well as it being something I mostly break down in discussions with other trans people). But yeah, we’re different and we challenge basic understandings of some of the foundations of society and culture, but our liberation helps break down the issues you’re already facing and a lot of the time the requests we’re making make life easier for cis people once y’all get used to us being around.