A sub called me to the front of the class while we were lining up for lunch to shame me for my atrocious handwriting in 4th grade.
She had a big drawn out discussion with me about how "shameful" it was that I still wrote like that at my age.
Yes, she used the word shameful.
I still think about it when I try to write at 28 and it looks awful. I can't do anything about it despite trying my whole life.
Edit: this happened while the entire class was standing in front of the door single file waiting to leave for lunch, so there were no distractions. Everyone saw and heard everything.