[klipt]

I think it stems from privilege.

Trans women are seen as seeking female privileges (like the ability to compete against women in sports, which is easier than competing against men). Which enrages some people.

Trans men are seen as giving up their female privileges, to which everyone shrugs and says "you want less privilege? Fine by me!"

[chillwaves]

Are there no privileges afforded to men?

I can think of at least one -- working in tech.

[klipt]

I've met quite a few trans women working in tech!

Of course men have privileges too, but I think many of men's privileges come from confounding variables. Like men are on average taller, and people are biased to view taller people as having more authority, so taller people are more likely to become CEOs etc.

Whereas women's privileges come from society compensating for men's privileges. So society sees women on average are smaller and physically weaker, and thus decides they need privileges like separate sports to compensate.

Trans women who went through male puberty often have the size advantage of men, so them also have the social privileges of women is seen as double dipping.

While for trans men it's the opposite, they're often small like women, but not afforded social protection for it.

Anyway that's just my theory why some people hate trans women more than trans men. I myself have sympathy for both cases, dysphoria sounds pretty awful.