What is it to show off?

I've no idea why do some people love to show off with their intelligence? Does possessing extra knowledge makes you proud and arrogant?
I just couldn't bear to hear nor look at these arrogant peacock.

A simple question not even addressing to you,and yet you're anxious to answer in your arrogant tone. Do you really think that this would amaze people?
Yes,it might in the past;but not anymore.

There is nothing to be proud of regardless what you know; There is nothing to be shame of regardless what you do not know.
So why do you have to compete with everyone to show that you're mighty?
People would just label you as the so-called "kiasu" instead of giving you applause for what you know

There is nothing wrong to be smart or hardworking, but there is something wrong when you try to act proud and talk in such impolite manner,especially to the elderly or respected person.

So,what is it to show off?
~This attitude would not bring one far~