Absolutely horrendous. Please never listen to whoever gave you that. I am very serious: that shows such a lack of understanding anything about people, whoever is using this as a teaching material should be fired and banned from working with children. But they won’t, because toxic bullshit like this is what administrators love.

I am really sorry this is your educational experience. It is not supposed to be like this. Introversion and extroversion are just stupid labels that try to make things easy. Those labeled introverts are often the most generous, thoughtful people who actually listen to and cooperate with others.