Was it in a private or public school? Anecdotal but I've never seen that when I was in school in the 90s. Friends who went to "good" private schools though complained about public shaming and had similar experiences to the one you had.

Also in terms of teaching, I actually appreciated the fact that we had a lot of compositions that emphasised critical thinking (more so than I had when I went to Germany for 6 months as an exchange student). Wonder if that's because things have changed since the 90s or if it's due to the private/public school difference.

On the other hand, I was very heavily bullied in middle school but that was by other kids not by professors. And once I got to High school the bullying completely stopped.