Sarcasm is an adjusted stress reaction.

Yes. THIS. I mean, she's supremely fucked up and all, but you can tell that she was made that way by Ozai. And it probably doesn't help that the last year or two before we meet her, she probably hasn't had much to do with people who aren't Ozai or Ozai's yeshotmen, what with the rest of the family gone and her two actual friends elsewhere. (Okay, Li and Lo have been around, but I don't quite get them. Does ANYONE get them? That twin double-act is seriously weird sometimes.)

But then I remembered the other thing Jaime is best known for, aside from regicide. *awkward*

... but, but, but Zucest! (Ah, not that Zuko seems like he'd be into it, but Azula really kind of does sometimes.)