She didn't actually say that. You read into it.
Of course it is men who get to decide how they define and perform their manhood.
It's just that before making that choice, you should know that if y'all choose a certain version, you're choosing against a version that women will find romantically appealing. Women won't want you in their lives.
You do you. Just make an informed decision and don't bitch and moan when it was your decision all along.
You get to make your choice as a man. Nobody else has to like or live with your choice though because you think it's a swell idea.
They get to choose for themselves as well.