There are tons of extroverts who are unpleasant to be around. It's almost as if this introvert/extrovert thing has no bearing on whether someone is a power-abusing, sexually-harassing asshole or not, shocking I know.
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Not to mention, who ever said that these assholes are introverts? One obvious troll said it (without any reasoning/justification) and some people are just going along with it like gospel.