As a teenager the only source of information at hand for me was encyclopedias and dictionaries ( no Internet in 1983 hehe)). I remember looking up "tranvestite"and finding it defined primarily as something done as an outlet for homosexuality. Most reference books seemed to make the assumption that any male who dressed or behaved as a woman was by default, homosexual. Consequently, in society most people would look at transgendered ladies as simply being gay, not considering that the matter was far more complex.
Now that male homosexuality is becoming (somewhat) less taboo, people are going to notice that most gay men (who are not otherwise transgendered) do not typically crossdress or identify as women, so hopefully society will gradually figure out that the two are not mutually inclusive.
Personally, I do not think anyone is 100% anything, be it "gay" or "straight".
Jonna