Egoism - A camouflage for insecurity ??

Is that what really it is ? I have never been able to understand how and why can someone be so self centered.
I have a friend who is quite successful and well educated and popular among his peer and collegues too. Though I wonder how many of those actually consider him a real frnd. Eveyone I have met has somethin or the other to say about him - and its seldom nice. Reason being - he talks like he is the "master of all trades".Ofcourse, there is no denying that he does know what he talks - most of the time; but its the haughty way he puts it is what irks everyone. In short - he is a perfect example of an egoist.
Now, why would I think that he is insecure...well... there are things that I have noticed about him that give me the impression. When someone points out a mistake that he has made - a genuine mistake

I was thinking of simply deleting this blog entry...but then I decided that it was better than nothing at all... :)