I hear that.
Most people have no idea what cognitive dissonance is and have never heard the term.
Of course, over the years I've found that if I change my language and approach things from different angles I can get most people to come around if given half a chance. The key is to find an approach where you don't challenge peoples belief systems.
For example, when talking about jury nullification, I normally start out by asking about bad laws that the person I'm talking with feel to be completely unjust, move into what they think can be done about them, and then move to asking about what would happen if people simply refused to convict.