Dumb people (untellectuals?) are more likely to fall into the trap of assigning traits and habits to people unfairly based on things like gender or race. Their brains require too much proccessing effort to compute better headers to categorise people under based on the patterns they observe in them (also hard). This ends in them choosing the more superficial characters in people as the core of their pattern-spotting. This incorrect practice of using superficial characters is further encouraged when a few of these “patterns” that untellectuals spot turn out to be vaguely correct. This happens when the characteristic chosen acts as an indicator rather than a direct cause.
When a person’s basic characteristics (sex, mother-tongue etc.) coupled with another one based on their life setting (place of residence etc.) cause their kind to be more likely to have a certain clearly-identifiable trait (poor, overweight etc), an untellectual might believe that the basic common character of the person is the reason for the certain clearly-identifiable trait. Let’s say there somehow were conditions such some decades ago that the poor people of region A, a region with mostly people of race X, found it in their best interest to migrate to region B. Now, an untellectual residing in region B today might look at this and make an unfair judgment. Race X here is just an indicator to the fact that the person had to migrate from region A to region B.
An easy conclusion to make here for a dumb person to make is “All the people of race X just aren’t competent enough and so they all inevitably fall into poverty”. An even dumber person here might even make a conclusion like “Race X is the inferior race and the people of race X all deserve to be poor because this is what God desires.”