Untrue, as a matter of fact. The explanation why is long and complicated but the short version goes like this:scorptatious said:It's one thing to teach people to respect the opposite sex, but teaching kids not to refer to people as a "him" or "her" would be pushing a bit too far. I mean a girl's a girl and a boy's a boy. You can't deny that.
Sex is whether you are male or female, according to biology. Penis and XY is boy, vagina and XX is girl, all is straightforward. Gender is whether you are male or female, according to psychology. This is less clear-cut. Most people, like you and me, are cisgendered. That means that they are, psychologically, the same gender as their sex. Other people are transgender (or genderqueer, or a number of other terms, but they all mean basically the same thing), which means they are not the same gender as their sex; this could mean they have the opposite gender to their sex, but it could just as well mean that they're gender-neutral. Using "him" or "her" to refer to someone who doesn't self-identify as either gender is actually quite rude.