The worst memory in school age.

I have a terrible experience that my 2th grade teacher ,in elementary school , scolded to me. One day, my best friend at that time fight with a boy in my class. Because the boy picked on her again and again. So she finally couldn't stand that, and fight with him. At that time, my class teacher came into the class, and saw the scene that they fought. So teacher scolded the children and gave both students punishment . But, I saw all of the situation between them. Moreover i knew that she got an undeserved scolding. So i told teacher about the truth. But teacher ignored my testimony. Besides she asked me cynically that are you a spokesperson for her~? As soon as i heard her mention, I was embarrassed. The teacher just mocking me. Didn't hear anything. So that memory is the worst for me.