I think it goes back to my high school days. In computer class the first assignment was to write a program to print the first 100 Fibonacci numbers. Instead I wrote a program that would steal passwords of students. My teacher gave me an A.
In other words if a teacher only teaches in one way then they conclude that the kids who can't learn well that way don't have the ability when in fact it may be that the way the teacher's teaching is not a particularly good match to the way those kids learn.
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A friend of mine said no matter what I do I always look like an English teacher. She actually said you still look like a Campbell's Soup kid.