Hi Jamie,
Although I understand what you are saying, and I think it should be no big deal for anyone to wear almost anything they want as long as it is not overtly offensive to others, I do understand the GG stance somewhat. If you wear earrings, or other female wear, it can be very embarrassing to her, especially in regards to friends and people she may work with. How you look is to some extent a reflection on her. As for at home, I can also understand how she may lose a lot of her sexual interest in a guy who dresses like a girl, though how sad that is. I don't like that, but I do have to try to see it through their perspective.
