I assumed that the guy's comment ("...when that Clemente fellow was a lazy malingering hypochondriac") was sarcasm. No?
In fairness, there was a time (early-on) when Clemente was booed by Pittsburgh fans...when a certain Pittsburgh newspaper reporter would interview Clemente and "quote" Clemente by spelling Clemente's comments phonetically, making fun of his accent. (Remember: there weren't very many Hispanic people living in Pittsburgh during Clemente's early days.) Hell, the TV people didn't even want Desi Arnaz to play Lucy's husband on "I Love Lucy" because of bigotry!
In his early days, Clemente - in the same manner as Ali - wasn't the popular, beloved athlete that he became later. The Pittsburgh fans were, at times, pretty nasty. But people either are too young to know that, or they've forgotten it.