Think of it this way: low-carb by itself is insanity. Why not tell them about the nutritious food you're eating? Vegetables, meats, occasional nuts and berries, like humanity has been eating for hundreds of thousands of years. This way of eating just happens to be low-carb, and is not low-carb by design, like some supplement-laden diets designed from the top down. I would try my best not to even utter the word "carbohydrate" in my conversations. Instead talk about the anti-nutrients in grains and the effects of too much sugar on the liver and tissues of the body.
You lousy kids! Get off my savannah!