They didn't expect the Comic-Con crowd to react negatively.
Comic Con wants movies. They're not the typical Disney going crowd - I'd wager most of them prefer Uni style parks, grittier bathroom humor, and so forth. The typical comic-con 'princess' carries a gun or knife or sword, likely has a ripped dress, leather, and or fishnet stockings on.
She's uh, to quote another wonderful song "A freak, one you don't take home to mother"
Not that there's anything wrong with that!