A Grass Valley, California substitute teacher went ballistic on the 13-year-old son of law enforcement officers this week for daring to wear a Thin Blue Line mask in his class.

The incident was captured on video and has since gone viral:

In the video, you can see the substitute teacher berate Lucas for wearing the mask and tell him that it's not okay to support law enforcement.

The teacher even goes as far as to say that he's "ashamed" of Lucas and his family.

Needless to say, this bullying behavior by the unhinged substitute teacher is unacceptable.

We must stand up against those who attack our law enforcement officers and their families.

Thank you for your service, Lillar family and especially Lucas for standing with those who stand for others.

Do you support Lucas in wearing a thin blue line mask at school? Let us know in the comments below.