I think you are misinterpreting exposed. It just means shown for what it is. It doesn't mean the person "exposed" is a bum or any insult at all. At the time casual boxing people thought Naz was the best fighter in the world even though they were hiding him from Marquez and Mayweather. In this case exposed simply means shown to the masses that he wasn't the Superman they thought. He was exposed as a beatable great champion who was highly entertaining.
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