Substitute teachers follow the instructions given by the teacher. Substitute teachers overstep bounds by introducing material the teacher would not want them to focus on.
For example, I worked in a class where the teacher said the Civil War was not about slavery, rather “economic issues,” he said. The Civil War had nothing to do with slavery, the teacher taught. I held my tongue and explained the teacher’s instructions. I wrote the teacher a note about my opinion on his position, he didn’t mind the critique, and I filled in for the teacher multiple times after that.
A Trump-loving substitute teacher in Wake County, North Carolina didn’t follow the teacher’s lesson plan. Instead of accurately describing Dr. Martin Luther King, Jr.’s death as an assassination, she said King killed himself. A complete falsehood.
The teacher had trouble calming the music class down, so she went on a tirade about Dr. King and the way an African American child dressed. The teacher allegedly called the student's clothes “prison attire.”