When a Teacher Is Wrong

What do you do when you know a teacher is wrong but won't admit it?

A friend's child was taught by a first year teacher using an incorrect textbook, probably outdated too.  The child was taught, given a page to label from the text, told to study, and then tested.  On the test, the child labeled the diagram correctly, ignoring the incorrect information taught and labeled.  These items were counted wrong and points taken off.  When my friend questioned it, she was told by the teacher that she referenced the text book, a co-worker, and had given the children the information to study.  She didn't apologize, didn't change the grade, and wouldn't acknowledge that she, the book, and her co-worker are wrong, and everything else found on the internet, other text books, other resources, and the knowledge of three Doctors go against what she says/found.

This is what bothers me:
1. An entire grade level of children was taught incorrectly.
2. The teacher would not admit she was wrong, right the wrong, reteach the students, and correct the grade. She still believes she is right.
3. It is possible an entire grade level across an entire district has learned the information incorrectly.
4. A text book used across the country is wrong.

How would you handle a situation like this?



Side note:  I am sure I possibly taught things wrong and handled situations incorrectly as a young teacher, but I hope with the experiences I have gained that I would handle those situations better now.