No rule changes are required for this purpose. As a spectator you can simply stop watching.

I disagree. Just toying with the puck and not trying to score is humiliating the other team. Being better or dominant is not classless. These are grown adults on both teams who know that 100% effort is required and should never have to apologize for winning or losing by whatever goal differential. If you are a severe underdog you are still brave for trying your best and maybe you even inspire future generation in your country to pursue the same sport and maybe win an olympic gold medal some day.