When a boy was born, he was taught to “be a man”. Every man learns since they were kids how to be a real man. They were taught about “the man box”: rules that our society create to show how men are supposed to be. These rules give men the mentality and the behaviors of how they supposed to act in the society. If they’re not behaving like the image that “the man box” has created, people will end up calling them: pussy, weak, gay, etc. So if they don’t want the society to judge them, especially women, they have to act like a man, like how the box shows them to.