Yeah, I had one particularly bad teacher like that. I was a quiet and generally good kid. She was typically assigned "bad" kids, because of her reputation as "tough". So, she decided I was a bad kid, with no evidence, and was simply mean to me. All year.
Being a small town, my mom runs into her every now and then. To this day, she's convinced I was a "bad kid" and she "straightened me out". From what my mom reports, she feels that I am where I am today in large part due to her influence.
I am where I am in spite of people like her, not because of them. The only thing she taught me, was how to deal with mean people in positions of abusive power.