Comment by babycake

There are lots of reasons that a society would change. Some factors would include newer generations introducing ideas that the older generation didn't take heed to.

Marriage used to be strictly between a man and a woman. Now society says it can include homosexuals. Women used to stay at home to take care of the house, while men worked at jobs to provide for the entire family. Now society says both roles can be taken up by both men and women. Black people used to sit at the back of the bus, and now anyone can sit anywhere.

I mean, society constantly changes. We see it in history, we even see it today within our own lives. Places like Saudi Arabia are currently having their own version of woman's suffrage even as we speak.

So given this, in your example person, I would wager that society would deem that person not a man, since the hypothetical society has already decided it that way. But that's not to say that person will give up on not being recognized as a man. Our human history has shown us that we don't just stop at an idea, some of us go all the way to pave new rights for entire future generations to come.

Whether or not society adopts the new definitions, well, that's up to the people living in it.