I think a factor is that critical thinking is a skill that has been eroding in society across all levels for quite some time on. Even if more technically savvy,

I think a factor is that critical thinking is a skill that has been eroding in society across all levels for quite some time on. Even if more technically savvy, the "educated" are not better prepared to resist propaganda than the "uneducated". What the first group is, is more comfortable in processing and manipulating abstract ideas. This factor makes you more vulnerable to propaganda because of the natural tendency to dismiss data that does not confirm your working hypothesis as "noise". I am pretty sure highly focused propaganda will exploit specific cognitive biases of the "educated" too. The second group thinks in a more concrete fashion, so it is harder to dismiss conflicting evidence for them. So, they will get a gut feeling that there is something wrong with the hypothesis/propaganda, though they not necessarily can pinpoint what that might be. Attempts to make sense of these strange Rorscharch patterns provide the raw material for plenty conspiracy theories, too.