That is demeaning and paternalistic in addition to being false. They as rational as urban liberals, but their rationality, and their assessment of their class interests including their perception of their social class, is based on very different assumptions.
But you need to abandon the linear omniscient rationality model popular with neoclasscials and functionalists (linear means continuous and additive - as to balance out conflicting interests, omniscient means full unfiltered access to all relevant information).
Wojtek