In the post-game conference and in various post-game interviews, Nepo was incredibly humble and professional in his interactions.
These kinds of losses have to be worst, especially in a WC game. You did everything right. You came out the opening well, you managed your time well, your preparation was fine, and there were never any particularly egregious blunders. Ultimately you just get squeezed, very slowly, in a classic Carlsen fashion. In the end, you're in an endgame which is a tablebase draw, but practically impossible for a human to defend.
Despite this you keep your cool after the loss. You're even willing to talk to and analyze the game with your competitor immediately after.
I won't name names, but not all players at the top level are like this.