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Because the ANTI prefix in those qualities makes it impossible for the person possessing them to be considered "cute," meaning if you have a quality (from the list) with the ANTI prefix, you can no longer be considered cute, no matter how hard you try. And using the ^_^ emoticon and the word "NYA" in writing doesn't make you cute, nor does your communication style.
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And in general, Koteiko is more genuine than you. That's why I'm voting for him. He is sincere.