define carb sensitive. Are you saying that some people have different insulin sensitivity, different amounts of glut 4 transporters on adipocytes,myocytes, some people have insulin resistance, impaired insulin to glucagon ratio and secretion of insulin from beta cells. If so then yes some people are more or less sensitive to the role of glucose in the diet.
i would argue based on the evidence that low carb diets are healthier from a metabolic perspective and may offer some additional fat loss benefits.