Treated Differently!!!!

Today I while I was in class I was slapped by a fellow female student, the teacher looked up and laughed and asked;"What did I do?"I said nothing and she put her eyes back on her computer. So a few moments later I punched the girl who had slappped me in her and the teacher looked and and put me out of the class with a write-up. When I asked her why she wrote me up and not the girl she said because I am more manly.