well racist jokes are based off of steriotypes for the different races.. but I don't know if there are any steriotypes for white people.. actually I say that as a white person so I'm probably biased.. just look up some chris rock or some other non-white comedian stand up comedy and you'll probably find them do some jokes about white people. That would be my best advice.
I know all kinds of racist jokes but for some reason it doesn't seem like there are enough derogatory jokes in which white people are the target. And by target I mean the joke is malicous towards white peole not something trivial. For the most part white people don't really care that they can't dance or mind being called a cracker.
Anyways I couldn't recall a single racist joke that is really nasty towards white people.
I wrote one but I am no joke artist and it isn't that bad.
Q: Whats the difference between the devil and the white man?
A1: The devil is red
A2: The devil is already in hell the white man is just on his way their.
A3: The devil has a moral compass.