A sad thing

Last Wednesday，I made a thing that made me feel innocent and a little angery. In English listening class, the teacher checked our homework. Concidentally, she checked my homework. But I made a slip of the tongue, I said 'he' instead of 'she'. The teacher said I didn't finish the homework, that I didn't event open the book. So I felt very sad. And she said it in front of the class for three times. In fact, I seriously finished my homework. I saw the video at least seven times. And I wrote the phonetic alphabet for the new words. So I felt very sad. If a teacher makes a mistake because of a slip of the tongue, can I say she doesn't prepare lessons? As a matter of fact, she did. Therefore, I think she is not a good teacher. She judged me self-righteously. Even worse, the classmates also took this to make fun of me. I think the teacher has deeply hurt me. Fortunately, I don't feel sad and angry today. I can't say I hate her, but I will never like her. I learned something from this thing. Firstly, everyone shouldn't be self-rightous. Secondly, I should reduce my mistakes. Thirdly, angry just makes myself hurt. In addition, it's important to have a good teacher.