Consider an American food analogue. Do I distinguish good and bad grilled cheese? How can I when its identity is that of a basic, unhealthy, cheap, low-class food? If you add more exotic ingredients, it becomes distant from its quintessential identity, so it becomes "good" grilled cheese in inverse proportion to it being, actually, grilled cheese. Contrariwise, if you enhance it by further indulging in the fats, oils, salts, etc., can we say this is "better" when it has also become even more base, even more low class? It becomes better as it becomes worse.
I find myself wanting to say something similar to your friend. All the grilled cheese are the same to me. I can plainly see one is different than another, but they are all objects of derision, and they only rise above that derision insofar as they stop being grilled cheese.