Mishakawaskirt said,
A man dons a skirt ... And magically become(s) female and changed gender.
You're not only misunderstanding what was said in the headline, you're misunderstanding the term gender. The headline referred to "Gender Norms." That is, the actions, in this case presentation, generally expected of a masculine person.
In today's usage, gender refers to one's identity and presentation; masculine, feminine, something in between (such as sticking to most of the norms, but not all of them) or different. Whether you are male or female is one's sex; male, female, something in between (such as intersexed) or different (Even I'm not sure what that might be, but these days you have to leave all options open.).
We live in changing times so some things are confusing. But change has been a constant in the human condition. The only difference today is how fast the changes are coming and that it seems like the rate of change has been accelerating throughout our lifetimes.