Okay, If I did not listen to Rush I would give you that one.. But, I listen to him every day during lunch and have for years.
I think you have a skewed understanding of satire and so does a bit of his listening audience. Real satire has a greater intent of fixing a problem, while the method of reaching that cause can be things besides humor, there still is a greater cause for the satire.
What was the reason for his rant about the white kid getting beat up? If it was satire.. than what was he trying to improve?