He's annoyed he got aroused by a femme-looking guy that hid the face and showed a nice booty... a trap.
Trans are guys who have body dysmorphia and they do what medical science can do to transform into a female looking body...
a third category is Cross-Dressers or Transvestites (CDs or TVs) and they just dress like a chick, put on make-up and wigs, but at the end of the day are still men and a lot of them are straight.