If you don't ingest any carbohydrates at all, eat pure keto or pure Atkins, your body still needs glucose, but it can convert protein and fat, and even muscle, into glucose for your organs. So yes, you're right that you don't need to ingest carbohydrates/sugar.
Table sugar, white sugar, is interchangeably used by native Americans with flour as "The white man's poison". They use none of either in their diets, and when they started to when we forced them, they got very sick. Table sugar is indeed awful and there is no dietary reason to get it.
No need to throw out the baby with the bath water, ain't no shame in getting fructose through fruit. But people often confuse table sugar with glucose, because we tell family of diabetics that when they start going south, to have them munch on a Snickers or drink orange juice.