You miss the point. Pfc. Manning now identifies as Chelsea Manning. She is transgendered, and since her military career is toast she has come out of the closet on the subject.
I'm going to be generous and assume that duaneb poster was not closely following the story and is unaware of the above.
Transpersons are always the subject of massive flamewars online, so some folks get really strong kneejerk reactions to misgendering.