I have had good teachers and bad teachers, but I also have had two teachers who diametrically oppose each other in my mind.

My high school computer science teacher was a mean person. Like, she just was not a nice woman. But she was a very competent teacher. To this day, the foundations she helped me lay for computer programming have served me intensely well in a very programming heavy job.

My high school literature teacher, on the other hand, was nice, friendly, and possessed of absolutely nothing resembling a brain. Like, I feel bad talking badly about her, because she was always nice. But honestly, that woman had less brains than a jellyfish.

These two together convinced me that I am absolutely willing to work with people whom I do not like if they are competent at their jobs, but hate working with people who are nice if they cannot do their jobs.