I think I have a pretty good handle on the subject, natural foods contain "simple sugars". Synthetic sugars, such as corn syrup and high fructose corn syrup are simple sugars, honey is also a simple sugar.
But having weathered your insult, perhaps YOU would like to name one of these "hard to digest" sugars I failed to mention.
Natural foods, such as bananas, apples, etc, contain complex carbohydrates, which are metabolized much differently than simple sugars. Insult? That’s on you in your interpretation.