It must be something that is peculier to the West. In Asia, especially Thailand, it does not not matter. I have men hitting on me knowing I am, by reputation a tg female. I have dated men professing their love for me and its not only me, but my other local tg friends also. Most tg girls here are not lesbian. Many are getting married. Strangly, many with western men. Maybe its the western men living in the West and feeling pressure from their western peers, that makes them put up a front.
Of course being gay here is no big deal either.