Masculinity and Femininity have nothing to do with gender. Instead they discuss (from a cultural perspective) one’s social role in society.
The fundamental issue here is what motivates people, wanting to be the best (masculine) or liking what you do (feminine).
A high score (masculine) on this dimension indicates that the society will be driven by competition, achievement and success, with success being defined by the winner.
A low score (feminine) on the dimension means that the dominant values in society are caring for others and quality of life. Standing out from the crowd is not admirable.