Originally Posted by mom2one
When we had our talk, she also told me that she is the ultimate authority in the classroom, and not some book/other people (apparently, my child said that he read something in some other book, or he discussed something with a docent in some other place etc).
A good teacher would never say something like that. There are certainly some situations that warrant prompt correction, for example if the teacher writes "8+7=13" it is most helpful if a student points out the error and it is corrected promptly. The teacher might be embarassed, but they can turn it into a teachable moment.

There may be other situations when "correcting" a teacher is not so helpful, for example if it's a matter of opinion, or if the teacher is making an oversimplification of a topic that is appropriate for the audience within time constraints.