That depends on which of your evaluative judgements we consider to have what levels of noise. If we take a more sophisticated psychological view, it's actually very well-founded that at least some preferences are formed by our biology, and some others are formed by our early-life experiences, and then others are formed by experiences laid down when we've already got the foundations of a personality, and so on. And the "lower layers" are much less prone to change, or at least, to noisy change, to change without some particular life-event behind it.