Awful teachers

Can everyone share their experience with awful teachers this past year.

I'll go first.

One of my teachers would deliberately only teach to one side of the class while ignoring the other side (Explicitly mentioning that "oh i'm going to teach to the girls from now on") As they didn't answer the questions that she had been asking.

Which I guess is fair for one or two lessons but this would go on for almost every lesson following that, the other side of the class would be dumbfounded on what to do and she'd tell them to just do practice exams.

Another one of my teachers would go on and on about her kid and hardly ever teach us any content in the class. Most students had to learn the concepts on their own or rely on prior knowledge in the previous year. As a result she marked much more leniently to the class and the whole class got scaled down like crazy.