We conceive of racism as a set of institutional conditions of group inequality and an ideology of racial domination, in which the latter is characterized by a set of beliefs holding that the subordinate racial group is biologically or culturally inferior to the dominant racial group. These beliefs, in turn, are deployed to prescribe and legitimize society's discriminatory treatment of the subordinate group and to justify their lower status. source
The common definition of racism, and the one used by people who believe in reverse racism, is just "the belief that one race of people is better than another." Sure, that's the definition that comes up when you Google the term, but it's actually just the definition of racial prejudice. It's not the definition of racism used in scholarly discussion, or political debates, or by activists. The italicized definition at the top is an example of a definition that's actually used, that's actually correct.