First Amendment aside, I fear that restricting speech would result in a backlash from Neo-Nazi types, or worse, a national situation like The Gulag Archipelago describes.

How about teaching to think and write more accurately instead. "I would not have subjected my child to the humiliation of wearing a slave collar and manacles, and then photographing him, and then publishing the photograph. He is clearly shying away from the camera. He appears to be at a critical age developmentally. He may grow to resent this experience rather than learning anything from it."

Sending them back to high school-level English to read Roots and Black Like Me, and then write a paper might work. Framing it that way as a court-mandated punishment does not sound great on its face.

I suspect that some keyboard nazis just need to be exposed to more moderate discourse. However, that will not happen if they silo their discussions in sites like The Daily Stormer.