We’ve all heard the horror stories, and we all have a few of our own. “Ms. So-and-so made me cry in ninth grade,” or “Mr. What’s-his-face gave the worst assignments.” It’s an unavoidable part of being a student - eventually you will have that one professor, the one you’ll never forget, and not for good reasons.
Of course, there are great teachers out there too. The ones you’re crazy about and will remember forever, who write you that recommendation letter and get you into Stanford.