If you read my sentence properly, you would see I said a diet of sugar for carbs.
Still doesn't make a difference. First where did I say you should eat only sugar for carbs.
Using these all or nothing extremes as arguments why a food or macro is bad is stupid. By doing that you can make an argument for any food as being bad.
Eg, Drink a heap of water and it will kill you therefore water is bad for humans.