Masculinity-as-cultural-construct is one of those beliefs that sounds good in the abstract, perhaps. But I think most folks, men and women alike, feel deep in their gut that it isn’t so, isn’t desirable, and isn’t working. As someone who has examined the research and history of masculinity, I find the idea of it being wholly a cultural construct utterly untenable. It is a conclusion one can reach only by willfully ignoring large swaths of the data and the human experience.~ Brett McKay from, http://www.artofmanliness.com/2014/05/30/the-dead-end-roads-to-manhood/
Masculinity is not — not “entirely”, nor even “mostly” — a social construct. I believe one is free to attempt to take on whatever role one wishes. (I see that as one of the big benefits of our current level of human progress.) But if you attempt the role of a “Man”, you do not get to simply make up what you think a Man should be.