The WORST teacher that I ever had was my French teacher in the 10th grade.
He was a pig, in every sense of the word, and WORSE, encouraged the boys in the class to develop pig like attributes too.
He would send the girl with the shortest skirt up to the board so that he and the other pigs could leer and snigger to each other.
This was before women and girls actually were considered more than objects…
He had no idea of how to teach, and would boringly read aloud from the text but never engaged his classes interest in its contents.
He was short and fat and always had food spilt down his front(the class was the first one after the lunch break)
I had wonderful French teachers in later years and could only shake my head at that pointless year.