It's human nature to want to fit in with the group. Some people just aren't skilled enough and come off as "know it alls". Our schools create this by rewarding, if unintentionally, the kid who raises his hand first over the kid who knows the answer but is introverted and would rather not be noticed. "You know.. your "shy" little Johnny is smart but he needs to learn to speak up in class." Shy, quiet, introverted is "weird" or "bad"... While the pushy know-it-all's often win the "most likely to succeed" award.