Oh, sorry, I thought you were serious. Poe's Law and all that.
Well, I'll try to give you the best explanation I can:
Gender constructs and gender roles are arbitrary. They aren't biological, they are entirely made up by society and sustained by cultural inertia and traditionalism. Men are taught and pressured to be manly, and what constitutes as manliness varies from culture to culture and generation to generation, but it is always a list of traits and behaviours that all men are taught to strive for. Women, too, are taught to strive to be womanly. People are also taught to police each other's masculinity and femininity. Men are taught to mock and denigrate men who are not sufficiently manly or who are less manly than them, and women are taught to do the same with women who are less feminine than them or do not meet standards of femininity.
Some people do not agree with the message they are taught by society. They do not identify as the gender they are born in, and instead identify with the physical appearance, traits and behaviours of the opposite gender. These people are transgendered/transexuals, and most of them do believe in upholding traditional gender constructs- they just identify with the opposite gender they were born as.
Other people do not identify with either gender, and instead identify with either both genders simultaneously or with neither. These people are usually against traditional gender constructs, as they feel a very strong social pressure to conform to the gender they were born as, just like trans people, but they do not have the option of "passing" for either gender, which is an option that trans people do have (and often strive for). These people want to be allowed to be androgynous, agendered, third-gendered or whatever gender identity they identify as, but they are constantly policed by society, who sees them as a threat to the established gender constructs (because gender constructs are a tool of oppression, so without gender roles, it becomes very hard to convince men that risking their lives for the country is manly, or that women are supposed to be physically weak to be attractive, for example).
Does that help any?