I think we need to reflect on this within the context of the times. Juliet is pretty desperate. Her father, Capulet, has just called her an ungrateful strumpet and threatened to kick her out of his house if she doesn't marry Paris. Juliet is running out of options here. Girls were pretty much the property of their fathers until they got married. Although Capulet claimed earlier that Juliet needed to like Paris first, the truth is she was always subject to her father's decisions. When she refuses to marry Paris she goes from, in her father's eyes, Jewel of his life to common hussy. It's the old Madonna/whore complex. Juliet probably should have married Paris: she had no other practical options.