You're right. What this girl describes isn't even sexual "orientation", but an an extreme obsessive behaviour. Boys don't wear girls clothes because they will be made fun of, not because of a genetic issue. Girls who are shy about wearing mens clothes are responding to social effects. Girls who MUST wear this or that, or CAN'T wear this or that, are mentally disturbed.
I don't wear womens underwear because to do so feels silly...but do do so would not cause me to flip out.
I was a condo property manager six years ago and you would not believe the reaction my co-workers had.....when a "transexual" came into the office headquarters needing to speak to me. I had never met "Gail" but listened respectfully and patiently as she/he explained the problem they were having. My co-workers were very impressed with my patience and the fact that I did not burst out loud with laughter. What could I do.
Years before that, I was an aerobics instructor at a "only womens health club" and had a similar problem with a "transexual" as he was in the middle of making his transformation and had to explain to our members that it was somehow legal for "it" to be there......bizarre!!!!