The metaphor seems like it could lose most of its effectiveness on people who have never applied the outside view to how taste and tastiness feel from inside - they've never realized that chocolate tastes good because their brain fires "good taste" when it perceives the experience "chocolate taste". The obvious resulting cognitive dissonance (from "tastes bad for others") predictions match my observations, so I suspect this would be common among non-rationalists. If the Facebook conversation you mention is with people who haven't crossed that inferential gap yet, it might prove not that useful.