Anne Frank and her family were Jewish, and they were persecuted by the Nazis during the war. As a result, they had a strong dislike of the German occupiers and often referred to them as "Boches" or "the Germans" in a negative way.
In her diary, Anne Frank expresses her fear and hatred of the Nazis and their actions, and she uses the term "Boche" to express her contempt for them. For example, she writes in one entry, "I hate those Boches. They have done nothing but hurt and rob us."
The use of the term "Boche" in the Diary of Anne Frank provides context to the historical context of the war and the persecution of the Jewish people during that time.