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I interpreted this the same way cobrat did.</p>
<p>First Goldenboy says that Duke people are not arrogant, and then he appears to counter the negative associations people have by listing positive traits. Implying that extroversion is a positive trait infers that it is more desirable than introversion. That is, on the sliding-scale from introversion to extroversion, introversion would be the “negative” trait.</p>