Is narrow-mindedness a result of a lack of education?

I have heard that the average church-goer tends to reject high-class, well-educated people. The operative word here is average because there are obviously areas where the predominantly high-class, well-educated make up the congregation and therefore are not rejected as they are in the majority. However, I have even heard of one high-class couple who paid for the restoration of a church and were still considered unacceptable by the local church-goers. Why? Is it lack of education, jealousy of the well-to-do, or an inability to accept others as they are?