as a liberal i find that it is important to not shy away
  from controversy: women and men are biologically different.
  i am sorry, but they are.

That you felt the need to apologize for a statement that is so blatantly obvious even a small child could see it is telling. I understand why you did and find myself doing similar things. It's pitiful.

Unfortunately, your pre-emptive apology for recognizing the obvious won't save you from the mob - those whose minds are so rotted and aloof they insist everyone indulge their fantasy because they can't cope with reality. Feelings, safe spaces, groupthink, and all that.