This example is about an intern, I think it's especially important to be polite in this context.
Personally, I believe it a sign of immaturity to purposefully be rude in the workplace. Or that you don't have a life.
Simply explain that the information they need should be in their onboarding email, and maybe mention to make sure to read it carefully. You can also offer any other advice that might help them be more effective. Then move on. Being rude as a tactic for behavior modification can have some unintended consequences - like resentment, or a toxic culture.
Personally, I believe it a sign of immaturity to purposefully be rude in the workplace. Or that you don't have a life.
Simply explain that the information they need should be in their onboarding email, and maybe mention to make sure to read it carefully. You can also offer any other advice that might help them be more effective. Then move on. Being rude as a tactic for behavior modification can have some unintended consequences - like resentment, or a toxic culture.