Fair point, I forgot to qualify that as such. I still see it as an ideal though.
I don't understand why this is ideal.
I don't support inequality, sexism, or extreme gender roles and gender stereotyping. I don't care if people are gay, straight, or cross-dress. However, in this world, there are boys and girls, in much the same way there are humans and cats and zebras in this world. Why deny it? Calling a boy "boy/male" and girl "girl/female" isn't wrong. Discrimination itself is wrong.
I don't consider this unnecessary categorization. It's these same people who probably agree that we should celebrate our differences, and be more accepting of them. Do you achieve this by turning a blind eye and ignoring it? Wouldn't it be better to just tell your kids that everybody is different in some way, but that many of these differences are small, and that you should treat everyone with the same respect?
Also, while I'm against sexism and strict gender roles, I also recognize that men and women are different. While we should be treated equally in terms of workplace opportunities, the law, etc, some gender roles exist because women and men are different. Men and women are different -- think differently, "feel" differently, worry differently, shop differently, make decisions and conclusions differently, etc. I'm not saying that women belong in the kitchen while men should make all the money, but there are things that men do because of something ingrained, not necessarily because society says it's their manly duty.