Words have meaning, and "snark" isn't just "giving someone a response that absolutely does not fulfill their request." Snark is very much about tone, and it is

Words have meaning, and "snark" isn't just "giving someone a response that absolutely does not fulfill their request." Snark is very much about tone, and it is absolutely possible to give a response like the GP with no snark whatsoever. If they give their answer with absolute sincerity, it may be rude, and it may be unhelpful, and it may even be arrogant (it may not—those are all very context-dependent)—but none of those things make it snarky.