Ladyboy "bump"
DWB gave an awesome response as did Nikki. Shemale is the general "catch all" though most fans tend to recognize any of those terms kristen listed on a page and go from there. Not until you get into a hardcore detailed Shemale subniched site that you clearly define each one and educate many end users. Most don't know themselves, only what they're attracted to.
Some of the larger sites have helped define what each is. For example whenever I hear "Tgirl" I think of Black because of the Black-Tgirls site. One thing for certain a "Ladyboy" is always SE Asian (mostly Thai since that's the highest concentration of content with some Laos, Cambodian and Vietnamese thrown in). Any other use of the term Ladyboy just looks silly and misinformed.
DWB put it perfectly about the Fiipino cultural view. The Catholic religion enables people to harshly judge anything without acceptance and, as long as they ask for forgiveness later it's all good. Where other SE Asian countries are heavily Buddist and tolerance is practiced. Those with differences are accepted or at least tolerated.