One reason is because being passive-aggressively pissed off at someone looks very much like certain introverted responses. Likewise, an "extroverted" person wit

One reason is because being passive-aggressively pissed off at someone looks very much like certain introverted responses. Likewise, an "extroverted" person with an off day will act "introverted" hence the follow up "you okay man?". In other words, a less than normal "extrovert" looks kinda like an "introvert".