Psychologist Prof Richard Wiseman likes doing experiments to debunk 'connoisseurs', most can't tell the difference they claim to when put in a double blind trial. Give people drinks where the flavour is mismatched to the colour (eg: raspberry flavour coloured orange), and they taste the colour not the flavour. Martin Lewis did some tests on premium vs budget food, and a large number couldn't tell the difference, or preferred the budget products.
In the bar at a local hotel I watched as they got a blindfold, and put four identical glasses on the bar with lager, bitter, Guinness & water in. Everyone howled with laughter when the first one got it wrong, and people were falling over themselves to show how it's done, but by the time a dozen or more had all got it wrong the volunteers were a lot thinner on the ground.