"Irreducible complexity" is a far more complex idea than what you decided to label it for, but it is more fun to reduce its complexity down to something you can mock. And just because some creationist clown mis-uses a tool doesn't mean the tool is useless.
Remember, a lot of things creationists thought irreducibly complex (the eye, the flagellum, etc.) have since fallen to explanations for their evolutions -- as have been pointed out numerous times on these threads.