Wtf Kim, she is in the hospital and just got out of surgery, why are you mad she didn't get up?? And he could have said something to her before, but he waits to tell her how to swing the sword better after she is badly injured. He also kept playing down her pain which is why it led to this. Yeah, I think anyone would hate him.
I do love her reaction when she found out he was right. You see the difference in them since if a cleaner said that to him, he would have never gone to get checked out. She figured that she would get it checked and then was surprised the cleaner was correct. She didn't 100% dismiss that a cleaner could be correct, she was more confused and figured to check it out. It shows that she sees cleaners as people while he doesn't.