Thank you for the responses to my post. It is good to see thoughtful ideas about whether there is a Torah view on civil gay marriage and the halachic requirements for tochacha when a non-Jew is violating one of the sheva mitzvos. (I honestly do appreciate it. It rasies the level of the conversation.)
But I will believe that the visceral attitude towards gays is l’shem shomayim, when I see the same attitude towards Hindus. Yes, Hindus hold public parades to celebrate their adherence to avodah zara.