Have a reference for this? Seems implausible, bacterial fermentation of any sugar in the intestines should result in distress, i.e. the same symptoms a lactose intolerant person would have upon drinking milk.
Point is, the products of bacterial metabolism of sugar in the human gut tend to cause issues, as in lactose intolerance, or the more rare sucrose intolerance. Hence my request for a citation on fibre delaying absorption of fructose so that "bacteria get most of it".
I am only passing on what Robert Lustig, who is in a position to know, reports. You would have to ask him.