In Boyne's The Boy in the Striped Pajamas, why does Bruno think the Fury is the rudest person he ever witnessed?

"The Fury," of course, is Bruno's erroneous pronunciation of Adolf Hitler's title: "the Führer." The exact words from the novel are that Bruno believes "the Fury" is “the rudest guest I ever seen.”  A few of the main reasons why Bruno thinks this are that Adolf Hitler invites himself to Bruno's house for dinner, marches inside, and immediately takes Bruno's father's head spot at the dinner table.  Another reason that Bruno thinks Adolf Hitler is rude is...

"The Fury," of course, is Bruno's erroneous pronunciation of Adolf Hitler's title: "the Führer." The exact words from the novel are that Bruno believes "the Fury" is “the rudest guest I ever seen.”  A few of the main reasons why Bruno thinks this are that Adolf Hitler invites himself to Bruno's house for dinner, marches inside, and immediately takes Bruno's father's head spot at the dinner table.  Another reason that Bruno thinks Adolf Hitler is rude is the way that he treats Eva.  When Eva spends too long visiting with the children, Bruno hears Hitler "roar."  Then Hitler yells at Eva to come to his side by “clicking his fingers as if she were some sort of puppy dog.”  It is obvious to Bruno that Adolf Hitler immediately gets everything he wants despite his behavior.  There is also an indirect reason why Bruno believes "the Fury" to be very rude:  "the Fury" is the reason why Bruno and his family had to move from Berlin.  Because Bruno loved his home in Berlin (especially the banister and the fact that they lived close to Bruno's grandparents), Bruno is especially disgusted to be living near the concentration camp of "Out-With" (Auschwitz).