Post workout is the one time I was advised to go ahead and have sugary drinks or snacks, along with 40 grams of whey protein. The sugar goes directly into the muscles and helps with recovery, as does the protein, and a little glutamine. I mix up a shake with OJ, whey protein, and glutamine for post workout.
Everyone has their own definition of "bad" carbs, but I don't consider sweet potatoes to be in that category, or whole oats for that matter. Unless you're cutting weight and fat for some sort of competition.
