Transgender women are women. Same in counterpoint for men, it is pretty simple.
If a person truly loves another "gender", one should love the soul and spirit of the person along with the body that comes with it. No one has a choice on what body they are dealt with, but they do have a choice on being open-minded, loving people without prejudice, and not feeling shame or shaming others.
Transgender folks can teach CIS folks a lot about gender and sexuality since from day one they have had to work through many layers to find their true self.
That to me is simply the most beautiful thing about a human being. Being confident and loving oneself, because if they do that imagine how partnership is in return.