milk and sugar with that?

Years ago I weaned myself from loving cream in coffee down to only liking skim milk.  Now I find even half-in-half makes coffee undrinkable.  Whole milk, on the edge.

• really great coffee is great black and wrecked by sugar.
• somewhat bad coffee is drinkable only with sugar
• really bad coffee is undrinkable
• some great but strong coffee, such as some espresso, is improved by milk
• some mediocre coffee is best with both milk and sugar
• turbinado is the best sugar for coffee
• sometimes turbinado adds flavor to bland tea, but white sugar is better in mate or mate with tea