You make a good point. But if you refuse to give info and the folks eligable for government handouts do, then you are skewing the numbers in favor of more hand-outs.
I'm not sure what the ideal response it: If you were to lie and say that you were poor, would that then help them claim that there are more people who need help? Conversely, if you were to lie and say you are rich, would that then be used to claim that white males are doing so well that of course we should provide more to those "left behind"? I'm not sure of the right answer, which is why I assume that if ever asked I will just try to ignore them.