The Huffington Post explains what prompted this:
Limbaugh made the remark to suggest why President obama might have appeared preoccupied at church on the day of the operation to rescue the ship's captain, who was taken hostage by the pirates until Navy SEAL snipers shot them in a daring rescue effort.That says everything you need to know about Rush Limbaugh's mentality right there. Let's allow Shane Murphy to have the last word to the "Big, Fat Idiot": "[W]hat you said is evil. It's hate speech. I won't tolerate it."
"He was worried about the order he had given to wipe out three teenagers on the high seas," Limbaugh said. "Black Muslim teenagers."