Unlike other essays in this collection, Unpopular Essays by Bertrand Russell (Google Books), “The Superior Virtue of the Oppressed” continues to be relevant today. It made a big impression on me when I read it, and I recommend it to anyone who has not read it.
You can read pieces by progressive writers still and find examples of this form of thinking. In some cases, oppressed groups do demonstrate exceptionally virtuous behavior in the face of adversity. My belief is they would rather be treated equally, fairly, and justly, and be free to go about their own business without having to take on the difficulty of pushing back on oppression. And rather than assign them a morally superior role, people in a position to break down that oppression should do so without elevating or denigrating them. (In other words, treating them equally).
Read the essay. Then read more of Russell. Regardless of your thoughts on his arguments, he is a good read for many different reasons, not the least being that he is a fine example of what philosophical writing can be: clear, concise, thoughtful, and accessible.