I see two sides to this:

I was always a well-behaved student, and I watched my classmates make my teachers’ lives a living hell. They would leave school with headaches, tell us that their public school students behaved better than we did. If these girls were being redt Shidduchim a year out of high school, these teachers have a right to tell people what chutzpah these girls possessed. They had no sympathy for the teacher, no respect, and couldn’t behave like 12th graders.

If it were a few years later, I’d give them the courtesy of time, that these girls likely matured and regretted their behavior.

If you don’t want teachers to have anything bad to say about you, don’t give them anything bad to say about you.

FYI, the obnoxious troublemakers got married a few years before I did – proves that, really, when Hashem thinks it’s your time, it’s your time.