Either I missed this, or the past articles didn't mention it: The person who complained about The Earth, My Butt and Other Big Round Things and the Dan Elish book was a high school student. (Well, the second person who complained. The first time it happened, the challenger was a parent. The school went through the whole challenge process -- deciding, at the end, to keep the books. The student didn't agree with the outcome.)
From the Baltimore Sun:
Westminster High School junior Joel Ready felt so strongly that the books were inappropriate that he fired off letters last fall to Superintendent Charles I. Ecker and school board members seeking removal of The Earth, My Butt and Other Big Round Things by Carolyn Mackler and Born Too Short: The Confessions of an Eighth-Grade Basket Case by Dan Elish, after a committee decided to keep them in school libraries.
Maybe there should be some sort of double-jeopardy rule instituted for library books.