Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

At the end of S2E10 "Valar Morghulis" Game of Thrones Tyrion has been disgraced, removed from his role as Hand of the King and left in a small room following a successful defence of King's Landing? Why is he in such disgrace after successfully defending the city?
Why was Tyrion disgraced?