There is no place for racism in the NBA (or society more generally), and in light of recent incidents around the league, a general trend towards lifetime bans for those who attend live games and choose to deploy racist verbiage has become the consensus response.
Let me say that in general, this is the appropriate response - adults in 2019 ought to know better, and no one deserves to face that sort of behavior at all, least of all the stars of a league that is more than two-thirds non-white.