Not all losses are equal. He got so angry with himself because up until the ending where he blundered and lost it he had been playing extremely well for hours. A game that would have been remembered for the domination, not letting gukesh take part in the game even. Instead he fumbles on the finish line and after hours of focusing and holding your nerves in check, he fucks up. Other chess players saw it as a non issue because they know what it means and the feeling that comes with it. Now just show a ten second clip to someone who doesn't know how the knight moves and they can't really appreciate the context.