Misconception of the quiet people
It might have been nice to be taught in school that there were different temperaments among people and that, for example, being quiet was ok. Even if, in fact, in most of the cases the whole world would always seem quite a bit uncomfortable about the way quiet people are... about their "difficulty to speak", their "lack of confidence" or their "bitter temperament".
What if the word "timid" wouldn't exist? The same way there is really extroverted people whom just can't stop talking and the competitive business world and many other areas are dominated by them, there are also really quiet people with their own and valuable kind of competence, confidence and sociability.