Cinderella like many other fairy tales have a common set up that illustrate helpless girls gaining success and happiness through marrying a perfect prince and moving into his castle. This motif is not a realistic aspiration for girls to look up to. This inspires sitting around waiting to be "saved" by a prince. Instead girls should be learning to independent and make their own success by saving themselves from their problems.
The motif also puts unrealistic pressure on boys. They are expected to come and sweep a girl off her feet. If a boy is not completely perfect and living up to fairy tale dreams a girl will just turn him away. Both genders should learn to live for themselves and be happy in their own lives before adding anyone else to it.