The race-hustlers have no legs to stand on here. Or least not any more legs than they’d have with any random criticism of Obama. The image has nothing to do with black people. It is adapted from the villain in the most recent Batman film, who was white. So they can’t even claim the wide, red smile has something to do with black people eating watermelons, or whatever. The white guy had a wide, red smile, too, and it wasn’t racist then.
I think that is what pisses them off the most...they know there is no real racial element to The Joker image and it kills them.