There is, actually, a difference. Notwithstanding the difference in connotation (which is significant, but you seem to be willingly ignoring), there is a pretty important difference in denotation.
An underinformed person could get informed, a dumb person maybe not. There are far more underrepresented groups than just minorities, so equating the two is simply ignoring critical facts about the world. And though broke and poor are pretty close to being synonyms, there is still a distinction: broke implies a temporary state.
One day you'll learn that the world is more nuanced than your absolutism would have. Perhaps we can have a reasonable discussion then. For now I'm done feeding the trolls.