We're going to be honest here - we don't know whether Cara Delevingne was being serious when she expressed her distaste for the character of Margo Roth Spiegelman in 'Paper Towns' during an interview, or whether she was just joking around with reporters. Actors have to do dozens - sometimes hundreds - of interviews in support of a film. Eventually, they get bored of being asked the same question, and start to give sarcastic answers.
In the case of Delevingne, she responded to a question about whether her character was much like her real-life persona with "No. I actually hate her." There was laughter in the room - albeit nervous laughter - and the interview carried on. As it turned out, the producers of the movie weren't all too pleased with Delevingne's careless answer, and let her know about it in no uncertain terms. If she didn't really dislike the part before, we bet she does now.