Because my teacher said that my attitude was "shit"
He spoke to me after class one day, and said this to me. I was incredibly offended, especially because all of my other teachers say that I'm "excellent to teach" or that they "enjoy having you in the classroom"
And he basically just asked me to drop because he didn't like my attitude, and then I just stopped trying. Now, I hate the entire subject. Yay!
EDIT: Oh! I forgot. and everyday I didn't drop he would ask me when I was dropping... loudly... infront of the whole class... and he would consistently make fun of me infront of the class. It was great!