In one sense, it is understandable - appearance does effect our other senses. We are likely to describe a woman dressed up for clubbing as a bubbly party girl even before we discover anything about her inner qualities. Likewise, one un-made up and dressed plain will likely cause us to determine that she's the shy, retiring type. Keep in mind also that the 'experts' were oenology students, studying the science of wine, not sommeliers or tasting experts. At competitions true experts can identify a single vintage from a single vineyard or the percentages of a complex blend with incredible accuracy, so it's not just a matter of chance/prejudice.
I was blind challenged by friends once - a Barolo, Tempranillo, Malbec, MSG Rhone, and a Zinfandel. Hit 100% (receives applause).
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