The media say racism is about Asians attacking whites. An attack on a white man in Oldham is assumed to be evidence of this. But white people are not stopped and searched by the police for no other reason than the colour of their skin. White people are not denied jobs simply because they are white. Black people suffer all of this and are still at the bottom of the pile in housing.
Black people face discrimination from the police and the courts.
This is racism. This is systematic discrimination. Racism is a product of the bosses' attempt at divide and rule. They laugh all the way to the bank if white workers are conned into blaming black workers for the problems we all share. The extreme end of that racism is violent attacks.