It is also a useful heuristic, if you are trying to understand how someone else answered a question, that you shouldn't reason "But that isn't a useful way to answer the question!" and then become confused rather than annoyed. As I said, I would readily agree to the statement, but disagreement seems defensible if only vacuously and it seems wrong to interpret it as "stupidity" (though it would certainly reveal that someone is looking for reasons they are allowed to disagree).