Well, the "joke" loses its impact when you try to clean it up.
Here is a link to the exact quote
It is obnoxious.
However, the "I'll tell you what the coloreds want. It's three things: .... " is racist by your definition.
"We non-blacks want civilized things, of course. The black animals, on the other hand, only want three things, namely .... "
My point is racism by definition is used by blacks as a sledgehammer for anything these days. They would be well served if they reread the story of the girl who cried wolf.
Because quite frankly, the awful horror of institutionalized human slavery is being marginalized by the loose bandying about of the R word...