Yes, if being serious, I can see he is frustrated because he made a mistake that cost him lose an important tournament.

As simple as that. He just have anger control issue. Same as gamers who got killed in game they hit keyboard too.

But the public even though they aware of this, they probably still take this opportunity to manipulate scenario and take opportunity to attack Carlsen, especially the Carlsen haters and the Indians who feel triggered by the disrespect to their country victory.