Racism is racism, whether the group being stereotyped is a minority or a majority. It minimizes the detrimental effect of a racist behavior to say it's "reverse racism". It's euphemistic language that serves no purpose in its colloquial usage other than for a member of a majority group to claim victimization, usually when they themselves have exhibited a prejudice against the "reverse racist".

EDIT: to be clear, people who believe that reverse racism isn't a thing are semantically correct, it's just racism. And whether it's against a minority or majority group - terms which, themselves, are prime to define a disparity between two groups - it's unjustifiable.