IMO whats happening here is simple. people see trans women make egg jokes (which are essentially someone saying "haha i used to do that and so did my friends"). however, a trans woman is, in terms of social capital, the worst gender you can have. so to compare someone to a trans woman is the most gendered insult you can throw out. Now, because we want to be ostensibly accepting of trans people, we need another framwork to say its not ok to do this: misgendering. And so the egg joke gets interpreted as actual pressure to transition, complete with wording that sounds like if you asked ChatGPT to write SFW sissification. Which is ridiculous, but makes sense if you want to explain why a trans woman going "hahaha i used to do that when i was repressing" makes you deeply uncomfortable.