He seemed equally annoyed anytime he got asked about why it was taking so long to get the next book out (A Dance With Dragons was long overdue at that point). He basically went off on how entitled the fans acted thinking he was a monkey who should dance to their tune and produce things on their schedule.
That sort of prima donna act, combined with the ridiculously wait between Feast and Dance, was basically what killed my interest in the series. When he was doing his tour for the fourth book (Feast), he claimed that the book was too big to be bound properly, and would have to be split into two books, and the spectacularly mediocre Feast for Crows was the first one we got: the next one would follow shortly behind. Then years of ass-thumbing. By the time Dance came out, I didn't have any emotional investment in the story anymore.