I had a teacher in 4th grade that was an issue from day 1. My parents had moved right after Hurricane Hugo. I started at this school during the middle of the year, and due to the timing of everything also in the middle of the week.
The class had apparently been working on something earlier in the week that I was unaware of. The teacher hadn't mentioned it during my first day, and then expected me to have it on my second day. So my first grade in the class was a zero. It never went uphill. I have ADHD, and she was entirely unwilling to try at all with me; I spent many of my days in a vice principal's office. Generally she was unpleasant, and often specifically cruel to a 10yr old.
That school was doing a team teaching thing. Two teachers split subjects. I ended up with As and Bs in her teammate's classes, and Fs in all of her classes.
I did get some revenge on her later, but that's another story.