Again this is the problem with many whites. You want define racism to try making everyone else just as racist. But:
Definition of racism
1 : a belief that race is the primary determinant of human traits and capacities and that racial differences produce an inherent superiority of a particular race
2 a : a doctrine or political program based on the assumption of racism and designed to execute its principles
b : a political or social system founded on racism
3 : racial prejudice or discrimination
Systemic racism is part of the definition of racism. And even if we limit it to what you want it to mean, the belief in white supremacy has been a cause of world problems. So it is important for whites to work on ending the racism in their community. What you call racism by others is the reaction and anger caused by white racism. Certainly this must be hard to understand when people actually tell a black person how they are wrong or should not be angry when they post here like we have no right to be. In order for things to change, this attitude many whites have whereby they want immediately to tell everybody else how everybody is a racist when they are asked to cleanse their community of it must stop.
Racism is a relatively new concept to humanity. Racism did not exist 1,000 years ago or even further back. It is something that can be ended