I don't see that this is obviously false. Why shouldn't variations in physiology result in variations in taste? Even learned responses might become sufficiently hardwired to be irremediable. Hmmm. Good point (scientific too). Clutch, clutch, straw, straw. Not that I understand what anyone is trying to say. But the Presidents Bush both hate broccoli. I doubt they could be educated -- and, no, I'm not making a joke about their limited intellect. Some people just don't like some tastes. Many people don't like brussel sprouts, cauliflower, kidney, no matter how many of the top 500 chefs tell them that kidney's taste terrific.
