Ah, yes, the amorphous and mysterious "left" tricked everyone to changing the definition of the word in order to make you look bad. Quite a conspiracy.
Nobody is arguing that ridicule, satire, or parody are racist. Holding up a sign that says "NO MORE MUSLIMS" is racist. Acting as though all Muslims are fundamentalists is racist. Acting as though people of a particular religion or background are a secret cancer corrupting your society and trying to harm you is not only racist, but it was the basis for the worst act of racism in the history: The Holocaust.
The fact that you don't seem to be able to distinguish between criticism of Islam and discrimination/prejudice towards Muslims is exactly the problem, and exactly why you don't understand why it falls under racism. Your ignorance is demonstrating why it falls under the racism category.
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Do you think the tradition of women wearing skirts comes from a history of women being allowed to dress however they want and choosing to? No. It comes from women being told what is appropriate for them to wear. Women aren't wearing skirts today because they were given the choice in the past. They are wearing skirts today because our culture is still dictated by the norms set at a time when women were forced to dress certain ways.