Then we have essentially been talking about two different things. The cause of a person's sex (M/F) is understood to a greater degree, along with the host of variable X and Y chromsome combinations, than the cause of a person's gender. s gender simply a social construct? Are there biological differances aside from physicality between the sexes? What causes a person with a typical sex understand themselves to be a member of the other?
You are correct in that we are all human and individuals. Our commonalities are far greater than any differances.