The assumption that there's something wrong with not interacting with other people eagerly and often strikes me as oddly egotistical. Other people aren't alive solely for the enjoyment of extraverts. The "problem," if there is one, is that extraverts are uncomfortable and find it difficult to interact with introverts. But this is as much the fault of extraverted people as it is of introverted people. They speak a dif…
I act as an extravert in certain situations and as an introvert in others, so I feel qualified to answer your question. Extraverts don't always interact with everyone -- for example, in circles where social cliques are established, extraverts will interact with people outside of their clique less often. I call this "exclusionary" behavior -- one that serves to maintain the exclusiveness of the clique. Given that cases of extreme introversion are rare, an extravert A is more likely to interpret another individual B (who could well be an extreme introvert) as another extravert who simply shuns individual A so as to exclude A from his or her clique.
The reason this "misinterpretation" occurs is because extreme introversion is rare (1% of the population?) while exclusionary behavior (shunning others to maintain exclusive cliques) is relatively highly prevalent (20% of the population?). So the conditional probability that individual B is not an introvert but an extravert exhibiting exclusionary behavior is high. Basically, the extravert A makes a correct conclusion given the limited information he/she possesses. Because the introvert B is unlikely to engage into conversation with A, the individual A will never gain more information about B and will therefore maintain the conclusion that B is an asshole.