Unless there is a underlying health issue, then carbs are definitely not bad. They are your primary source for energy, they have muscle building properties, and they enable you to recover better from hard training.
If you remove carbs from your diet, you will likely see an immediate scale drop which is a result of water loss and a smaller amount of glycogen being stored in your muscles. This is not tissue weight loss. For this reason you may see carb free diets getting promoted, while they may work by creating a calorie deficit they are not going to be sustainable for most people, especially beginners. Once carbs are reintroduced into a diet then the immediate water/glycogen rebound will occur.
Carbs are not a requirement to lose or gain weight, but they make dieting with hard weight training much more efficient.