What's a good response to someone saying "just change your gender"?

In my country it has been made easier to change the gender in your passport. I think it's a good step forward. But since this has officially been decided, multiple times people used the sentence above for any gender related issue, with derogatory attitude. For example when talking about quota of women at work or pay gaps. When I just look at them, because I'm missing a good response, they add something like "now it's easy, everyone can change it just as they like". I don't know how to concisely respond to this. There are multiple things wrong - as if discrimination would disappear by "changing" gender and the obvious dissent about it being a progressive step that everyone can decide for themselves now what the gender entry in their ID is. What would be a good short response in a situation like this?