In the past few decades, reflecting merit and a concerted effort by the leagues, the number of African-Americans has increased in the managerial and coaching ranks of professional baseball, football, and basketball, and will likely do so in the future.
At the same time, those watching professional sporting events in gymnasiums, arenas, and stadiums remain substantially homogeneous.
Hispanics are found in large numbers at professional soccer games. Whites constitute the vast majority of observers at hockey, golf (as revealed among the spectators along the sidelines watching the U.S. Open during June 16-19, 2011), and tennis events. Football and basketball attract large audiences of African-Americans. So long as one can pay the entrance price at any of these events, there appears to be no systematic discrimination excluding one or another ethnic or racial group from attending the event of its choice.
Could these patterns be due to personal preference?