As an italian I'll never understand how big was the influence of Birth of a Nation in american people. Though that movie was a technical marvel, it basically spawned a lot of shitty stereotypes (black men eating fried chicken like beasts is one of them) and made the rebirth of the KKK happen. Racism was a (BIG) thing in the USA, sure, but it's still crazy to think about it.
The fact that this was brought up again by Bill Maher, a person whose ideas I often truly share, is miserable and tasteless.