Actual quote from Justice League: War (from the DC Animated Universe). Fantastic movie, and the banter between Green Lantern and Batman is great! (also the animation is closer to that of the New 52 style).
The Joker (occasionally using the pseudonym 'Joseph Kuhr') is a fictional character, a supervillan in the DC Comics universe. Created by Jerry Robinson, Bill Finger and Bob Kane, he first appeared in Batman in
After re-watching The Dark Knight, I realize Joker has a point about humans