It's a fact, not a characterization. Prison inmates are a lower class than fast food employees, which are a lower class than construction workers, which are a lower class than finance managers, which are a lower class than optometrists, which are a lower class than brain surgeons, which are a lower class than professional athletes. Does that mean that a professional athlete has more worth as a human being than a fast food employee? Certainly not. But in a world where there's lower, working, middle, and upper-class, some folks are higher than others in terms of their lifestyle, income, benefits, and social status.