I agree with this.
I live in California. In our high school, we have a horrible, deemed-to-be-racist teacher. Everybody I know hates her, and she doesn’t even function well as a teacher. When someone asked my history teacher why they can’t fire her, she said it’s because she has been teaching for 10+ years.
I see both sides to this argument. Teachers who taught that long should not be fired just like that, but when a teacher is this horrible… they won’t even talk to her. They just simply ignore her.