There are two major definitions of racism.
1. Racism that assumes that everyone of a particular race or ethnic group is inferior. This is the traditional and basic definition.
2. Racism + power - a definition that assumes you can only be racist if you have power, which many liberals define as being white, male, heterosexual, able-bodied. With this definition, a black can hate Asians but not be considered racist, because blacks are assumed not to have power - black President, black attorney general and major media heads like Oprah aside.
The "power" definition lets someone lazily say all whites are racist, while denying the racism of blacks who attack whites, hispanics and Asians in the "knockout game", injuring if not killing people for fun because the target is of a different race.
Likewise, this argument ignores black and hispanic gangs targeting each other, to the point of Hispanics driving blacks out of communities in California by threat and force, because somehow the actual violence of hispanics attacking blacks isn't considered racism under this model - though hatred based on race is racist.