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. A tiny minority of whites, often encouraged by organised racists and Nazis, can target black people. The united response of black and white people against such attacks has played a key role in undermining racism. But official scapegoating and despair in working class areas mean they continue.