I'm surprised (smirk) G&M readers are not more informed.  Racism-generally understood as antipathy, prejudice, discrimination against people based on 'race', which most take as phenotypic characteristics -skin colour (no biological basis for race beyond that) and a belief that one's race is superior.  Thus, it can be argued that a racialised person who believes him/herself to be superior to a white person could be said to be racist.  What makes white racism pernicious  is power, which whites inarguably have held throughout history, and which is inherent in western social/political/economic systems that has been promulgated through colonialism, (cultural) imperialism etc.  Whites may not have a monopoly on racism but they benefit from racist systems/practices and they have the power to negatively affect the lives of racialised groups.  I'd argue that in most places on the planet whiteness=privileged status.  Doesnt mean whites dont have problems/hard lives, imagine all that + racism.