I can't understand why a non-sequitur post like this would get upvotes unless people were just unironically in favor of moral relativism when it goes their way.

It's specifically because it's anti-LGBT. Hatred is starting to outpace pragmatism, and thus resistance is going to turn into vengeance. It was inevitable; the pendulum was always going to swing back in a big way. I can't blame people for feeling that way but I still don't like to see it.