"Racism is usually defined as views, practices and actions reflecting the belief that humanity is divided into distinct biological groups called races and that members of a certain race share certain attributes which make that group as a whole less desirable, more desirable, inferior or superior."
Wikipedia.
What your quote says: "...practices and actions reflecting the belief that humanity is divided into groups called races."
I don't see how my definition is all that far off.
That's the important part. "Using race as a classification upon which you base your actions" is not by definition racism. Just as using sex as a classification upon which to base actions is not sexism. There is a requirement that those classifications must be used to discriminate or suggest that another group is superior in order for it to be racism or sexism.
Thus your definition is wrong because you selectively ignored a key part of the actual definition.