How does Maria react when Bruno calls his father stupid?

Maria gets extremely angry at Bruno and tells him he should never speak of his father that way again. 

On Page Fifty-Nine, Bruno is lying on his bed staring at the cracks in the ceiling. Maria enters his room and begins to put away his folded laundry. He engages her in conversation, hoping she will agree with him that Out-With is a horrible place, but she avoids saying anything negative. Bruno thoughtlessly says, "Stupid Father," which causes Maria to recoil in horror (59). She tells him that his father is a good man: her own mother worked as a dressmaker for Bruno's Grandmother. Bruno's Father paid for Maria's mother's hospital care and funeral when she became ill and eventually died, and then offered Maria and home, food, and a job in his household. She hints that she cannot understand how such a good man could be doing Father's job at Out-With, without actually saying those words.

After Bruno calls his father stupid, Maria is horrified, insisting that his father is a good man.