You shouldn't judge people based on their race.
Mike is a sports announcer, and he is calling a professional game.
Mike wants to talk about the players.
Mike calls the game as he sees it and compliments the players who are doing well.
Mike makes a comment about a black player and how he must be naturally gifted athletically, so he didn't have to work hard to go pro.
Viewers enjoy Mike's no nonsense approach to commentating and enjoy the game.
Viewers are offended by the insinuations Mike's comment makes and dislike him as a commentator.