Why the hell is changing your sex marker controversial?

Yes trans people who have medically started transitioning should be allowed to change their marker. I have seen trans people who are okay with what trump is doing, but don’t realize this can and will put trans people in danger. Trans people have a right to privacy and safety, we want to live a quiet peaceful life. Having your birth sex on your documents isn’t going to be peaceful because now we have to put ourselves out their for everyone to know. Why should I have to now explain how I’m trans and that’s why my ID says that? ITS NOT YOUR BUSINESS, leave us the fuck alone.