Sugars is what the body runs on. Saying it is poison is equal to saying water is poison, because too much water will kill you. Or salt, or fats, or anything the human body depends on - you can have too much of it all, but it isn't poison.
Source: I gave a presentation once in middle school. ;)
Don't people remember the story of the woman who died drinking water to win a Nintendo? http://www.cbsnews.com/news/woman-dies-after-water-drinking-...