I recently saw some writings from another thinker who conceives/defines something way differently than I do.
In their world-of-terms (this is not meant as diminutive; we all have worlds-of-terms, and there are various consenses that people struggle to build either within a community or society-at-large):
It is impossible for someone of a marginalised group to exhibit racism, because racism is defined as a tool of the dominant social forces against minorities. At most, members of marginalised groups may exhibit bigotry.
In my world-of-terms:Racism is a natural and usually-harmful expression of in-group mentality, primarily done by individuals to others outside their most coarse hereditary background. Institutionalised racism is a meaningful term, but it is also the kind of racism most easily misattributed in the less-obvious-cases, as racism is about intent (if there is no racist intent, there is no racism, although there still may remain injustice).
There's not a lot more I can say about this; both views seem coherent to me.