Frankly the mere fact that there are some gay high school pupils willing to be "out" in the media is itself an act of bravery, and a significant step forward from a generation ago. That should be a reason for all lovers of freedom to celebrate - young people should not be scared to be who they are.
Now the article itself is lazy journalism (and some journalists think bloggers are "light") as it interviews not one school principal about its policies, so there hasn't been a chance to determine what school policies actually are - simply what a lobby group says (it may be right or wrong, but it is wrong to not check with some schools as to what their views are). However it is wrong for the Human Rights Commission to be involved. This should be a matter between pupils, schools, parents and others who wish to make their points of view heard.
My view is schools should be open, and frankly let pupils bring whoever they wish as long as they do not pose a risk to others. The sex of a partner should be irrelevant. Independent schools have the choice to make their own decisions on this - as any private institutions should. That doesn't mean that they would be right in being bigoted on this, but it should be their choice. State schools should not have that choice at all - the state should not be bigoted.
So I offer my support to pupils who seek to end such bigotry, good for you. I'm not gay, but I remember chillingly the bigotry in the mid 1980s when the Homosexual Law Reform Bill was being put through Parliament. Those who opposed that were nasty vile filthy bigots. Teenage years are difficult ones as it is, without people threatening or judging you for what are harmless feelings.