The fact that you said two genders is somehow equated with Newton's laws shows me you're laboring under ideology. Clearly, science has presented facts that show there are more than two genders, and that the very concept of gender is constructed. There's really no debating this at this point since not only the biological evidence shows a significant portion of human beings do not fall into the male and female binary, but that some entire societies don't ascribe to the division either.
Which means these things are socially constructed, or as you put it, normative.
Again, that wasn't the point Sarkozy made by mentioning the Yellow Sun. Hairsplitting when the thing is right in front of us. Free at last! Free at last! Thank God Almighty, we are free at last! (Martin Luther King)
Try to look into the incidence of hermaphroditism.
The numbers are much greater than you apparently believe.
Like I said, a poll in Kansas yields the absolute truth that the world was created by God.
If that's not ideology, I don't know what is. And those who are certain there are only two genders are indeed also laboring under an ideology.
But, you'd be quite surprised about this: "Make a poll anywhere you like, see if they're are more than two genders..."
If I took that poll on a Native American reservation that's aware of traditions, if I took that poll in parts of the Dominican Republic, and elsewhere, the results would reveal that people believe there are more than two genders.