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Psychologically, I'd assume that they still have good feelings associated with playing the game normally, but have become bored of the game. Rather than look for a new game, they stick to an older one and play it differently, because it's safer than being disappointed and/or bad at another game.
As for treating the other player like they did something wrong, that's just salt. To them, the game is not playing the game. When you don't participate, they've lost, and they're taking the loss poorly.