Frankly, and this could be more information than anyone wants, when transvestites talk about a "third gender" what they're actually talking about is bi-sexuality: dressing in woman's clothing and having sex with men. They're drag queens. They just use the "third gender" line as a justification for having gay sex.
People who are truly gender dysphoric - transsexuals - view themselves as one of the two genders and would be insulted to be labelled a "third gender".
This is all part of the liberal squish-head plan to make every deviancy normal and acceptable, and to blur the lines between right and wrong. They are all followers of that ass Michel Foucault, a French perv whose ideas they want to be accepted as the norm in this country. And it looks like they are making some progress.