what context? a metaphor for some self defeating habit of the student?
To me, context is everything. The kids in the class were “rowdy” and wouldn’t settle down. One boy complained he couldn’t do his art work because his fingers were hurting. The teacher then replied, “go shoot yourself”. IMHO a simple “don’t say this again” is suffice. My own parents would say “cry me a river” when we complained about stupid stuff. Just a different sort of saying in a way. Just a thought.