Doing your best on the court is not poor sportsmanship. Gloating, taunting, self-congratulatory celebration—all of which have become commonplace nowadays—do offend my sensibilities, “white” or otherwise. But giving your utmost, striving for the best possible result, shows respect for your opponent and for the game itself. Win every point you can, demolish him if possible, but then shake his hand, congratulate his effort, accept victory with grace and modesty: that’s what sportsmanship means.
And if the opponent has made a specific point of his unsportsmanlike behavior, then I as a spectator am happy to see him demolished. If that constitutes “white sensibilities,” I plead guilty.