If it was hard to tell if it was serious or sarcastic, well, it would be doubly hard given the practical drunken state that Sokka was in. In the end, Sokka pretty much decides not to care.

"Well, iz... good for us in the long run," Sokka says. "Hey, I'll take all the good news I can get!" Sokka holds a hand up, pointing to the sky, as if there's an actual point here. "I mean, the Hotel's good an' all, but I kinda want an apartment again."