No there not, however they may not be your best friend depending on how much fat you hold. There is an old saying "You have to deserve your carbs". Unless you can see you abs coming coming though then you can't handle them. Most people can't handle carbs and for different reasons, age, muscle percentage and how learn you are now are strong indicators of how well or not you tolerate carbs.
Michael Phelps in his hay-day was know for eating between 8-10000 calories per day and this wasn't solely down to his heavy training sessions on the pool. He was in his 20's, stood 6 feet 4 and had lean muscle mass throughout his body and trained day in day out.
A couch potato who's only exercise might be getting up and down from the seat and clicking a mouse doesn't need a whole lot of calories.Would Michael phelps need a large amount of carbs? Of course as the majority of his stores have been burnt away in his muscles and possibly liver.