It's about people. There's a huge gray area in the middle, once which most people won't or can't accept the existence of. Some people are attracted to both sexes, but only one sex romantically. Some are attracted to both romantically and sexually, but one more than the other. Some just aren't attracted to anyone.
Humans are too varied to label.
But we try anyone. And therein lies the problem. Most of these kids are so scared about being the dreaded g-word because of what they're taught. Look at society. And our kids see that and absorb it.