Why is extroversion seen as a privilege?
The assumption is that extroverts are sociable, easy to get along with and trustworthy. Finding work and progressing in work, is considered easier for extroverts because it often relies on networking. If we think about job interviews, the process is set up in a way that favours extroversion due to the requirement of speaking on the spot and being sociable.
There is also an assumption that introverts are reserved and not as sociable, due to the fact that they enjoy spending time alone and are often more productive when they are given time to prepare. Given an introvert’s personality trait of thinking before speaking, they are often perceived as slower to respond and therefore less capable at their work.