Understand that the fundamental differences between men and women are their reproductive system and their endocrine system. A mans body is designed or developed to function through masculine behaviors and women's body is designed to perform feminine behaviors.
Every person is capable of doing both. The post in OP isn't saying that women are all feminine energy or that men are all masculine energy. We all have varying levels. It might be easier to think of it in terms of hormones instead if energies.
Yes, there are masculine females and feminine males. However, when that occurs those people tend to adjust and alter their bodies through behavior, clothing, hormone therapy, surgeries, etc to align themselves with their energy. Don't think of masculine and feminine as black and white, when there are shades of gray. That is a very westernized way of thinking, just like we see male and female as black and white, there are intersex people.
You should look up the concept of ying-yang. Even looking at the symbol you will notice that there aren't just two distinct seperate parts. Inside the black, there is white and inside the white there is black. Even things that are seemingly opposite are interconnected that is the beauty of nature and relativity.