
The idea is that gender is a social construct. There are norms and aesthetics associated with gender and therefore it is not a concrete biological concept and even changes over time. Sex on the other hand is rooted in the type of gametes you produce, which is correlated with your chromosomes. This is a biological difference that can’t change even with hormones and surgery.
I mean it seems like you’re just upset at trans people for trying to pass as their desired gender, which, isn’t that kinda the goal? Depending on the environment most trans people are open about disclosing their identity when asked, but most times it just doesn’t come up bc it’s not relevant, people are just tryna live their lives