Before we begin, what exactly does the dictionary say that "masculinity" is?

Noun Masculinity: qualities or attributes regarded as characteristic of men or boys.

Now we face our first issue. That issue is that most people do not use the word "Masculinity" according to that definition. When we speak about masculinity, we often speak of the good and virtue of men. But this definition we find in the dictionary does also include all the bad sides of men. As we cannot simply reprogram men biologically, it's not really possible to redefine masculine biology.

Second issue. There is already a term that regard only the good and virtues traits of men. It's known as "Virtues Masculinity". So there is nothing to "redefine". The issue with these terms, is that they are made by individuals such as myself. And while i might disregard what other's define as virtues masculinity, and instead use my own definition. You face a new issue; Who's definition of virtues masculinity to follow?