According to KOVR-TV, the 16-year-old student was in his bedroom participating in an online class for Colusa High School when his chemistry teacher took issue with the sign and demanded that he take it down or adjust the camera view.
"Since school has begun, my son has had this Trump flag hanging in his background," the student's mother, Tiffany, told the news outlet. Their last names have been withheld from reports.
According to the student's mother, the teacher told her son, "You can sit up, remove the flag, or reposition your camera within the next 15 seconds or I'm kicking you out of class."
In a video of the incident, recorded by another student and included in the news video below, the teacher can be heard counting to 15 seconds while repeating the threat.
As the video shows, the teacher wasn't able to complete the count before the student decided to sign off from the class on his own. He can be seen waving to the camera before the screen goes black.