It’s terrible the teacher called the little boy “fat”.
I had a nun criticize my handwriting in 3rd grade. I can still see her looking at me and saying “You write like a boy.” This was 55 years ago and it made me self-conscious of my handwriting for the rest of my life. Can’t imagine if a teacher had called me “fat”.
My sixth grade nun crumpled my paper up, threw it in my face and screeched, “Chicken scratch!!!” Still remember that humiliation and never did learn to write any better.