The problem here is that some people *are* smarter than others. Some people are more informed; some are better able to reason; some are more creative; some have deeper insights, etc.<quoted text>
No, educational barrier is not that, it's a breakdown in communication when you think you are smarter than others.
If you are less informed, your opinion carries less weight. If your 'facts' are wrong, then your conclusions are potentially invalid.
The problem is that people have a bias towards the *truth* as opposed to mere *opinions*. The difference is that truth can be backed up by facts, observation, and testing, while opinions are yours alone.
There does not *have* to be a breakdown of communication simply because one person is smarter than another---the one less informed can become more informed; or the subject can change and the one who previously was more informed can now be less informed in the new subject and can learn from that.