"There was never a good Dalek."
I’m glad Clara called the Doctor on his behaviour here. Though I do have to say that I don’t think she needed to slap him to do it. I believe that there are other ways to get his attention and snap him out of whatever dark path his mind is currently rampaging down then to slap him. He’s smarter than that. His companions are smarter than that. It’s one of the things I never really got about River and I hope that they don’t continue it with Clara.
Though…on the flip side, I do believe that the Doctor does anticipate every slap coming his way and on some level decides if he really deserves it or not. He is capable of stopping the slap (see The Name of the Doctor) but he decides to take it because maybe it is what he needs.