I have to say that if I'd seen that one I also would have flagged it. Learning now that it would have been pointless I've downvoted it instead. Either way, you're correct: That is not an answer. It's not even a reasonable comment.
Don't get too disheartened by the declines. As a general rule they will occur less frequently as you're flag weight rises. I've had some for reasons I can't understand but just accept that as part of the deal.