Why are Hulga and Manley drawn to each other in "Good Country People"?

There is a
sense of "otherness" about both of them which draw them to each other.  She rejects
those around her--her mother, her mother's friends, others in the community--for being ignorant
and uneducated.  She rejects their "happy" attitudes by changing her name from
"Joy" to "Hulga"--you can't much uglier than...