I have a theory about this, actually, at least when it comes to white trans women (who by and large seem to be the biggest offenders when it comes to this type of behavior). It's something that's very difficult to put to words without sounding like a raging asshole but I do think there's some merit to it. My theory is that the reason so many white trans women—particularly young, freshly out of the closet, chronically online trans women—are Like That™ is because they are scrambling to regain the protection of white maleness they weren't aware they were forfeiting by transitioning.
The protection whiteness provides to a cisgender white man is fundamentally different from the protection whiteness provides to a cisgender white woman. This isn't to say that the protection of white maleness is unconditional, because it isn't. But the fundamental difference is that, at the end of the day, white AMAB people are born with the protection of whiteness. They can lose that protection by failing to comply with societal expectations, but it is still something they lose. And, a white cisgender man will never lose all of the protections of being a white cisgender man, despite what many white cis gay and neurodivergent men will tell you.
On the other hand, white AFAB people are not automatically born with the protection of whiteness. Instead, white AFAB people have to earn the protection of whiteness by complying with their own oppression through gender-conforming behavior (IE Not Being Queer Or Trans Or Fat Or.........) and, critically, by wielding the power of white supremacy and patriarchy against others, primarily queer people and people of color. But because white women are by and large conditioned from birth to earn that protection, you never see a white cisgender woman in the wild who doesn't have it, at least to some extent.
What that means is that your average white trans woman in all likelihood has no idea that the white cisgender women around her are playing a completely different game. The white trans woman has been raised to believe that the game is simple: comply with your gender role, and you'll be fine. She doesn't want to comply with the white male gender role anymore, but that's okay; if she sinks all of her time and energy and resources into transitioning into a perfect example of the white female gender role, she will be treated just like a cisgender white woman, with all of the power and privilege of whiteness that cis men have (except, y'know, the normal misogyny that white women willingly endure day to day in order to hold onto white privilege).
The problem is that that's not how it works. For trans people, once the cat's out of the closet, there's no reversing it. White supremacy and patriarchy will never accept a trans person, no matter how perfectly they comply with their gender role, because that's not how the game works. A trans woman will always be seen as a man who forfeited manhood, and a trans man will always be seen as a woman who failed at womanhood. (Note the use of forfeited vs. failed; that matters.)
So now you have a bunch of white trans women who are realizing that transitioning isn't all it was cracked up to be in the sense that they aren't being accepted as white women, no matter how hard they try to play the role, and they're all finding each other online and sharing their experiences. And because they're white, they think that being denied all of the power and privileges they think other white women have as their birthright is the highest form of oppression a human can experience. When in reality, those white cis women were always in a much more precarious situation than white cis men and are just collectively really really good at not rocking the boat, a boat the white trans woman will never be able to board to begin with.
And, because compliance isn't working for these white trans women the way they thought, they move right along to step 2, which is to wield the white privilege that they do still have (because they do still have some! just not as much as they thought they would, which to a white person is the same thing as being oppressed!) against other queer people and people of color. The end result: a generation of chronically online white trans women who think and act like tradwife mean girls.