Conservative columnist Piers Akerman took things a step further, taking aim at one of the young girls featured in the documentary, explicitly telling her she's not "normal."

"Twelve-year-old Ebony is quoted saying: 'It's not normal. You're not normal.' They're the kind of things that go through my head.'," wrote Akerman.

He then quoted the definition of normal as it appears in the Oxford Dictionary and pointed to census figures that show the relative rarity of same-sex couples with children in Australia.

"Children in same-sex couple families are one in a thousand of all children in couple families (0.1 per cent). Statistically, you are not in a "normal" family, no matter how many LGBTIQ-friendly docos you may be forced to watch by politically-driven school principals," Akerman wrote.

The NSW government reacted swiftly to the "outrage", banning the film from being shown during class time.