They guy said that white people didn't like being in the minority and that things like different music at the games might help bring more white people out to Hawks games, because the rap and hip hop music doesn't reflect the values of white people. So the prevailing wisdom is that these are deplorable statements and he needs to leave or be kicked out.
Here's a story about it:
http://espn.go.com/nba/story/_/id/11486641/atlanta-hawks-upheaval-3-months-making
The inset to the story at espn is where sports writer J. A. Adande says that white owners don't reflect the views of the black community and so there needs to be more blacks owners.
Isn't that curious. Adande feels free to say the same exact thing about whites that the Hawks owner said about blacks and Adande's scalp isn't being requested.
Nope, not racist at all.