Well, what you're saying within your first paragraph sounds slightly different from what I'm criticizing. You seem to be placing the notion of prejudice or bias under the "-ism" umbrella, and then expanding the scope of discussion to refer to systemic inequalities. If my interpretation of your intent is correct, then you and I might be more on the same page than not. Others on the Left would claim that prejudices or biases aren't even part of the "-ism" family in the first place...at least, not when they're exhibited by members of a majority group.
What I'm attempting to do, through the three subcategories, is delineate the different TYPES of contexts in which bigotry and discrimination occur.
Regarding your second paragraph, I'd be interested in hearing more about your averse experiences based on your racial/ethnic characteristics -- *if* you are willing to share, that is. Or if you have already written specific past pieces that delve into such life experiences (to which you could refer me).
I actually reject the Center/Right premise of "moving on" (and nowhere in my article did I use those words, in fact) when these problems still clearly persist. We should have those discussions. So here's a thought-experiment for you: what might "atonement" look like? Is it acceptable for a person (who belongs to whichever privileged group we're examining, in a given scenario) to condemn their ancestors' actions, but, at the same time, not take personal responsibility for those acts themselves -- as long as they are becoming a part of the solution, to the best of their ability?
It's interesting that you bring up "intellectual gymnastics" -- because, in my view, that's the same tactic employed by people on the Left who try to rebrand hostile actions directed against members of a majority group as merely "prejudice." Acknowledging the cultural and social dynamics (in terms of adversity) is in no way erasing the systemic -- in fact, I'd argue they complement one another in that they highlight serious problems that very few people seem to want to deal with by using good-faith dialogue or action plans.
