Massive generalisation. My brother is an extrovert and he absolutely does know how to put others before himself.
Not all introverts and extroverts will to fall to another same set of rules outside their already agreed definition. Stop trying to look for something else
All of this is categorization. Boxes to put around people. There is a reason there is no medical diagnosis for introvert or extrovert, as there isn't with any Myers Briggs things. It can help one understand people in some ways, but can push one to misunderstandings. Source: parents in psych, and we can tell you what you think your Myers Briggs is shortly after meeting someone.
No they aren't, they are trying to get everyone else to conform to their preferences by forcing others to act extroverted instead of letting people be quiet in their proximity.