Blacks hating whites, why is it called reverse racism/discrimination?

i think those who are using this term should consider abolishing it and should be ashamed because if you call it reverse, it is like saying racism is going a wrong way and the right form of discrimination or racism should be whites hating on blacks. why call it reverse racism?presumably it is because historically whites have discriminated and are known to to be racists against blacks but this is the present. racism is wrong in all forms or whatever direction is going and if we really want to minimise and eventually eradicate it, we should stop using terms like this and concentrate of rooting out all the racists in our societies.