I still don’t know if I’m supposed to be annoyed with him or with her during that morning-after scene (I’m annoyed with him, mostly)

I am not totally sure on the intent of the scene either, but I felt like to me, it was really obvious that he was trying to be nice but doing the exact wrong thing, and that she didn't want to be a bitch to him but the whole baking thing is so bruised for her she couldn't stand it -- anyway, I just read it as being nobody's fault exactly and everybody's fault. And I thiiiiiiink that was probably the intent, though I'm not totally sure either.