i think this is the reason.
"300" is the name of an irresponsible, unethical and unscientific movie which portraits Persian Empire kings and soldiers as monsters and animals with body-piercing, armors, facial features and demonic behavior that seem to have sprung out from the dungeons of hell. The inaccurate and derogatory depiction of ancient Persians that according to all historical data conducted warfare with mastery and dignity, and looked nothing like science-fictional monsters, is a depiction of how movie studios and authors sacrifice historical accuracy for would-be profits.
It is a proven scholarly fact that the Persian Empire in 480 B.C was the most magnificent and civilized empire. Established by the Cyrus the great, the writer of the first human right declaration, Persians ruled over significant portions of Greater Iran, the east modern Afghanistan and beyond into central Asia; in the north and west all of Asia Minor (modern Turkey), the upper Balkans peninsula (Thrace), and most of the Black Sea coastal regions; in the west and southwest the territories of modern Iraq, northern Saudi-Arabia, Jordan, Israel, Lebanon, Syria, all significant population centers of ancient Egypt and as far west as portions of Libya. Having twenty nations under control, encompassing approximately 7.5 million square kilometers, unquestionably the Achaemenid Empire was territorially the largest empire of classical antiquity.
Based on the Zoroastrian doctrine, it was the strong emphasis on honesty and integrity that gave the ancient Persians credibility to rule the world, even in the eyes of the people belonging to the conquered nations (Herodotus, mid 5th century B.C). Truth for the sake of truth was the universal motto and the very core of the Persian culture that was followed not only by the great kings, but even the ordinary Persians made it a point to adhere to this code of conduct.