What people really mean here is that when you consume real fruit, you get fiber, vitamins, other micro nutrients and, yes, fructose. But the quantity of fructose you get is relatively small. When people drink fruit juice, basically all they are getting is the fructose (with water). And you're getting many apples worth at one time. This overloads the liver which starts turning the fructose into fat.

So eating an apple or an orange is fine. Drinking fruit juice is not. Hope this helps