The most hated character in most television shows is a woman. Women are just harder to portray as honest and hard working and much easier to portray as shrill and vindictive. However, I have no idea who Lily is or why exactly she is hated.
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Yoblazer: http://i33.tinypic.com/ml36gl_th.gif
Watch and you'll see... someday I'll be... part of your world!