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.
12 years of primary school and 4 years of college and she can't read?
How much hand-holding do you need? College is supposed to be for high-performing, high-IQ individuals. I realize that is no longer the case, and I realize that has not been the case for some time, but guess what.
You don't "skim" professional communications. You read them. And you read for comprehension and understanding.
I forget where and when I saw it - it's been awhile back, and I think it was in Fortune magazine, or maybe Forbes, but one of the primary skills that both United States military officers and Fortune 500 company managers wished more prospective employees had is greater reading and writing ability. It's no fucking surprise though, given we've allowed communications to devolve into emojis instead of well-thought out sentences.
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.