This might work, but as human beings we often have better options. If you just cooly explain why you a request is unreasonable, then that acts as a rebuke to t

This might work, but as human beings we often have better options. If you just cooly explain why you a request is unreasonable, then that acts as a rebuke to the requester. And it is one that can't be just dismissed as "ahh, she's on the rag".