It's made even worse for me; I have a hard time detecting sarcasm, so when I'm proofreading I can't tell if she's being playful or actually critical of him. I want to believe it's the former, but this coupled with a lot of those Japanese reviews complaining about Yuna's cruel nature...
I'm starting to give up with making sense out of all of this as well. I'm like, 'Oh, but this has to have meaning, right? It has to be part of the story, right?' but then I realised how ridiculous and convoluted it all sounds.
It's starting to become less like a story and more like both Nojima wanting to make Yuna his jerkwad, fanservice waifu; and finding a way to kick Tidus out of the story completely.