What is Alice Walker saying in "Everyday Use" about the nature of heritage?

It seems as though
Walker does not want us to agree with Dee or Dee's ideas about heritage because she presents Dee
as a relatively unsympathetic character.  She's described in ways that make her presence seem
painful or damaging to her family: she "burned [them] with knowledge" when she was
young, and she insisted that she would come to visit her mother and sister -- though she would
never bring her friends -- because she seemed to be embarrassed about where
and how they lived.  When she returns home, she is unkind and selfish, insisting that she be
allowed to take items...