As to Plato being "the Golden man" we have this from EAHP chapter five:
"The Platonists, however, could not boast of innocence themselves, because their own Arcesilaus was on record as hailing the founders of the school as "almost gods or relics of the race of gold." 46 Thus Epicurus, when dubbing Plato "the Golden," was possibly mocking his followers and not merely deriding his division of mankind on the basis of iron, silver, and gold."