He had a chance to define the way she interacts with him back at the start of their relationship - in the flashback a few chapters ago she worried a whole bunch and felt bad about tentatively criticizing his coaching skills; he kept acting like she was right to do so and it happened more and more until it became a bad habit. He should've been bolder about calling her out before she got so spoiled. There's a difference between cheeky and annoying - if she weren't so difficult we might've actually gotten some progress in this chapter.