… I do not think it means what you think it means. The header for BIG BROTHER, Bill Schmalfeldt’s latest Twitter handle, proclaims, “IGNORANCE IS STUPID.” (Have you noticed how often the Cabin Boy’s caps lock gets stuck?)
Ignorance is a lack of knowledge or information.
Stupidity is the quality of being unintelligent.
Ignorance usually responds to a dose of education, at least in the case of individuals of normal intelligence. Stupid, OTOH, is usually a permanent state.
I suppose it could be that ignorance is a consequence of the Cabin Boy’s natural condition. Stuck caps lock and stuck on stupid … it would explain a lot. Perhaps a diminished mental capacity defense will save him in the end.