Why do some confident people think they are better then shy people?

[Takkun.]

Just so you know - your brother's issue isn't confidence. Apparently, he needs to have more friends than he really has in order to validate himself. (really, your bro doesn't actually HAVE 500 friends.)

Confidence is something that usually shows that you have pride in yourself. That you have high self-esteem. (SOMETIMES. Confidence should not be confused with conceit, arrogance, etc.)

Having high self-esteem is regarded as a very good thing in society, so they think they're better because they follow social norms.

Shy people tend to...not be as socially high up.
Soyeah.

edit: you asked this in sociology, so I answered it in a fairly sociological way.
Just so you know - I'm shy, too. I honestly think you're confusing confidence with arrogance.