I'm with Genghis on this one. The justification for it is that the existance of minority groups within a larger group is to exercise a greater power than the individuals concerned can muster.
Let me explain... take Universities. They are not full of gays and lesbians, but in many universities (and the NUS too, I believe), they have a very loud voice through their LGB societies. They seek to advocate special treatment for their kind, at the neglect of the other members of the larger group.
This is the principal behind reverse discrimination. Someone in a majority group, like me (straight, white, male and in the aviation profession (which appears to be predominantly male at the moment)) cannot be discriminated against.
However if I was black, female and a lesbian, I would be a type of person grossly underrepresented in the aviation community. Therefore I'd probably want special treatment to see that I'm not discrimated against, wouldn't I? Fair enough.
However if these people feel that they are being discriminated against, should they not group together and make their voice heard? Well, I think "NO". Why? Because in so doing they are alienating themselves as a group... distancing themselves from the wider group as a whole, and in many cases instigating resentment amongst the people who are in the majority- who see that the minority are getting special treatment by an authority who fear the wrath of the anti-*ist brigade (and with it, public sympathy).
In short, and seperatism of a group within a group (and its associated pushes for special treatment) can only serve to erode the equal rights movement.
Beliefs, sexuality, gender, etc., has no relavence to the conduct of a safe flight. If the pilot is licenced, he or she can perform his or her duties to the standard required by the relavent authority. Any clubbing together of people based on a common factor (e.g., being gay) may be thought to be necessary in order to secure equal treatment- but in the end the 'equal' treatment will equate to positive discrimination and therefore breed resentment among the majority.
To illustrate my point, does anyone remember the 'rights for whites' slogans that were going up around the 1992 general election?