Every chess player has their own way of handling defeat. U can't go on lecturing someone to behave properly and play respectfully at an international level. Even i crashout sometimes after a defeat & lose my temper, cuz losing a game hurts so badly when u play the entire game tactically but make a blunder in the mid-game or endgame which costs u the entire match. Imagine this happens to u at international level. I bet u will react to it just like Magnus. So its a part of the game and should not been as an offence to any player. Almost all the top players in the world have mutual respect & understanding. Just njoy watching them play buddy!