One of the most compelling arguments that gender orientation resides somewhere other than genitalia is in intersexed people. Because with both sets of genetalia present, there is still a gender orientation self-perceived! Which proves that gender orientation resides somewhere other than that genetalia.
Just like it does for transgender people…
…just like it does for cis-gender people.
There is no reason to hate, no reason to reject…except for one’s own predilection for fear and ignorance.