Wow! That is very surprising to me, I thought the guy had better manners than that. Of all the years he has been playing chess there is really no excuse for that type of behavior. Well, I guess this is one more reason to fear the Polgar sisters.
It's not just badly behaved children...

She flagged him whilst pawns down in a rook and pawn ending, i would have resigned and shown the guy some respect!

Gumpty my mate, you're a grown man who plays chess socially. Korchnoi's opponent was a child with ambition. Time is an element in speed chess, flagging whilst ahead happens to all of us, he could have shown more grace.

The Petrosian was crying, when he got a news, that the Korchnoi will be his next opponent on the Pretenders Match!
How hard should it be to show a little class? It was just a speed game. He may have had an edge, but he lost on time. He lost.

Who was the worse between the two? Unless I misunderstood the situation, it seemd like Susan (EDIT: It was Sofia... thanks Much_Afraid) unleashed an unprovoked verbal attack against Korchnoi.
"I was afraid to lose the respect, but now... [inaudible]" ... "Excuse me but I won the game... [inaudible]"
Unless there was some backstory to this vignette that could possible justify this, it would seem to me that Susan (EDIT: Sofia) was the instagator. No? Does anyone know more about this?

Yea that's the main problem here, I read just about all of the (200+) comments on youtube about this video and no one can seem to pin down what exactly she is saying. The Polgar fans translate her garbles to something benign while the Korchnoi fans swear to the death that she has bombarded him with insults beyond belief. Without a reliable transcript its hard to make a judgement. Personally I can't imagine that she would instigate the old man but then again I am a Polgar fan. Btw it's Sofia not Susan.
... who can't control their temper, when they lose a game of blitz. Check this out:
http://www.youtube.com/watch?v=M9k5oBgaZGI&feature=related
I already knew Korchnoi to be a cantankerous old goat, but this takes the biscuit. I'll have to re-evaluate my impressions of Korchnoi, after that shocking display of bad manners. How embarassing for him (not losing to a young girl) the tantrum afterwards!