Did you know that I saw my third grade teacher when I was working at the grocery store?
No I didn't know that. Did you like your teacher?
Not really, she used to berate me in front of the other students.
That sounds like you had a tough experience in school. If she's an abusive teacher, then you should report her to the school so they can look into her behavior.
It was too long ago, I don't think they'll do anything to her.
By saying something and making the school aware of how she acted you could still help other students. The school should know about her behavior if you feel like it was abusive. No one should treat students so poorly.