[That's... a weird, yet somehow perfectly reasonable answer to that question. Fair enough. Except, you know, for the fact that they're in a world that literally came into existence while they were standing in it, but he's just going to let that one go for once.]

Yes... perhaps they're native here, and we're not. Like foreigners. Which would, relatively speaking, make them alien. [he's not going to let go of this, though, so he's going all-in with the condescension.] I know for a fact that this isn't any world I've ever been to, and I doubt it's yours, either. But sure, go ahead and convince yourself that you've just taken a wrong turn and ended up in a country where the lakes are alcoholic and fire doesn't burn. Sounds reasonable to me.