An amazingly horrible person. I wonder if it was his attitude towards women, or if it was his attitude towards everyone, but he was just a coward and was too afraid t abuse a man.
In grade school, my son was not paying attention in class. The teacher went to the back of the room to see what he was reading, approved, and told him to keep doing it.
And if such a customer were a woman, a “Karen”, who abused only male baristas in that way, what name would be used to describe that horrible person?