Who were the worst leaders you ever had?

Worst boss I ever had was at my first workplace, I had 4 shift managers and I always had to work with one in each shift. 3 of them were great, I learned from all of them whenever I did a mistake they would teach me to how to solve it and how to avoid repeating the same mistake and in many cases they covered for me. The other boss never taught me anything, when I did a mistake he would just berate me and wouldn’t teach me the right way of doing things and sometimes he would blame me on his mistakes taking advantage of the fact that my word was worth less than his. He always took advantage of his position as boss to take credit of things his employees did and to blame his employees with his mistakes.