And for whatever it's worth, Prudie has never heard of anyone saying, Stepdad, please pass the salt, so forget that one.
Prudie does not have a good relationship with her stepdad. 
mnli hypothesis: Prudie does not have a good relationship with her stepdad.  premise: And for whatever it's worth, Prudie has never heard of anyone saying, Stepdad, please pass the salt, so forget that one.