You should never teach the students to hate the gay student, but condemn their lifestyle choice.
Moreover, I would not expect a teacher to advocate for gay marriage like is done in the Coca-Cola ad.
Lifestyle choices are between parent and child.
We got into this trouble, because we did allow teachers to talk about life-style choices, and they came down on the wrong side.
You are exactly right when it comes to the commercial, and the advocacy it displays.
And when folks stop by to blur these distinctions, it causes some of us to address them for exactly what they are.
- not you by the way -