I already know that some will say that men's and women's roles can be interchangeable. And I agree.

This is actually an elitist notion. If how we behave reflects our upbringing, then it may be that some roles, including "manhood," require a lifetime of preparation, at least for most people. Interchangeable roles cannot be learned in childhood. Only a relatively low number of people can "decide" at adulthood what role to play. For most people, the choice is made at birth, and they spend their childhoods bending the twig so that the tree will grow strong.

Modern feminism denies the importance of childhood role modeling. In that regard, it is a movement of intellectuals, by intellectuals, and for intellectuals. That's not to say it doesn't have pedestrian followers; many intellectual movements do. But the number of people who are capable of choosing their roles and doing them well is about equal to the number who are willing to contribute according to their abilities and receive according to their needs. (The inherent denial of human nature in both movements is not a coincidence but a commonality.)