I agree 100% with your guess. He's doing the extremely typical subversive thing of arguing for the thin end of the wedge of a belief system, pretending he doesn't know anything about the rest of the belief system for which he is arguing, then trying to convince the opponent that it won't be as bad as they're making it out to be if you just give in. If that isn't what has been done to the western world for decades I don't know what it is.
We just want gay marriage you guys
This will make us like the West, which is fighting with that belief system right now
What belief system, I don't know what you're talking about, I've never heard of that. This idea I want is completely isolated and will never lead to any other similar belief systems sprouting up, nor will you become like the other countries currently fighting it. You don't want to be like [Group of Bad Countries] do you? :^)
I agree 100% with your guess. He's doing the extremely typical subversive thing of arguing for the thin end of the wedge of a belief system, pretending he doesn't know anything about the rest of the belief system for which he is arguing, then trying to convince the opponent that it won't be as bad as they're making it out to be if you just give in. If that isn't what has been done to the western world for decades I don't know what it is.