You seem to be equivocating on gender and sex (something the list warned you about!). Gender roles are social constructs… so yes, obviously, whatever we do, we will be taking people’s (socially approved) “delusions and hallucinations” at face value. Whether you are delusional in believing that “this bathroom is a special place for men” or “dresses are special clothes for women”, these delusions are socially perpetuated, and change based on society. So it may happen that (to take the programmer list as an example), on Facebook there are 5 (or 50) socially appropriate genders. It may happen that in the PS bathroom there are two appropriate genders. You can see why taking the PS list as equal to the FB list would be suboptimal :-)
Moreover, it is silly to argue that people seeking to change the social order by claiming a third gender are as insane as people that we would commonly define as delusional and hallucinating… So I assume that you are using bombastic language to grab our attention. Is your argument actually that you feel bad about social change, and want us to stop doing it?
True—but in the context of the top post, you can and should be looking at cases where gender roles are non-traditional. After all, this is a post about edge cases and overgeneralized beliefs. Gender roles are an excellent example of arbitrary rules being over applied. This applies both to cases when we are dealing with other members of our own culture, and with members of other cultures.