What made the worst teacher you ever had so bad?

My 4th grade teacher had every student in the class gather around me and say everything they didn't like about me. Thanks for the trauma, bitch.

She was just simply a nasty person. Clearly had no time or respect for anyone who wasn't an absolute natural at her subject (maths) and if you weren't good at it (like me, I was terrible), even if you really wanted to put the effort in to improve, she would treat you like absolute dirt. She also had a voice like a screeching tyre.

One day someone stabbed me in my foot during class (I went to a rough school) and, with my sock absolutely saturated with blood, I asked if I could go to the medical room to get patched up. She actually said no, and that I could "hold it in" until the end, 45 minutes later. It was only when I was about to pass out around 10 mins later that she relented and said "FINE! GO! But you better have your homework in tomorrow morning!"

When someone committed arson on the school and almost burned it down, the fire originated in her classroom. I wasn't surprised.

She hit on me. Didn't bite, she slept with another random student. Got fired. New teacher didn't accept the extra credit project I did for the original teacher. I'll forever hate her.

My intro to materials science professor would basically come in and read powerpoint slides for 50 minutes. I'm sure he knew something was up when the class average on every test was under 40% (and in one case under 30%), but he never changed anything. It was very dry material, he was heavily accented and monotoned, everybody had trouble retaining the information. Curved grades sure saved a lot of people from failing.

I had a lit teacher my senior year of high school, that asked the class to write an opinionated paper about whatever subject we wanted (Not sure why. This was a lit class not a comp class). I wrote my paper about my objections to the Iraq and Afghan wars. She redacted large portions of my paper with black marker and then gave me a 0.

When I raised by protest in front of the class, she told me that I needed to keep my dangerous and seditious thoughts to myself. I don't remember the exact chain of words used in my expletive laced rant, but I remember calling her a fascist and compared her to Hitler with bad knees... She sent me to the vice principal's office.

The really funny thing though, was that while I was waiting in the office, classes had changed and my friend (He had written a paper about Palestine and Israel, that was also treated similarly to mine), also called her Hitler with bad knees and was sent to join me... lol

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My 5'th thru 8th year math teacher couldn't teach shit no matter how hard he tried. The man had absolutely no imagination at all.

I swear to god, for 4 years straight he greeted the class in the absolute same way, in the same tone of voice and wearing the same suit. "Good day ( then kids said good day) sit down"

Had classmates that had him in highschool too. Same thing for 4 more years. Only thing that changed was the suit.

My 7th grade English teacher took every opportunity to mock and degrade his students. Seriously, why would you exercise your superiority complex on 12 year old kids?

Math teacher, 10th and 11th grade. She absolutely refused to believe that I and a friend of mine were legitimately having trouble understanding what she was teaching. She accused my friend of having a "mental block" about math because he liked to cause trouble.