A guy like this has a very wide donking range. He just happened to have the absolute top of his range this time, and there is no way, you can ever fold, especially not when he size down on the river. In fact I would probably have raised a player like this on the flop and stacked off, especially when he only started with 60BB. So you lost the absolute minimum in the hand.
Dont assume, you did anything wrong, just because you lost a pot. Losing pots is part of poker and can not be avoided by playing well. If the best player always won, it would be chess, and guys like this one would not be in the game. The fact, that he sometimes get lucky like this is, what keep him coming back, and math will take care of him in the long run.
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