Please understand that I am not a fan of Sarah Palin or her family, but I think you need to look within my friend - the term "White Trash" was utilized initially by black slaves so they could have someone to "look down on". As you are doing.the etymology of 'white trash' is such that it originated by black folks to delineate racist whites from non-racist whites. it is used to emphasize moral failings. i understand the point you think you are making, but it is a false equivalence.
"The term white trash first came into common use in the 1830s as a pejorative used by house slaves against poor whites. In 1833 Fanny Kemble, an English actress visiting Georgia, noted in her journal: "The slaves themselves entertain the very highest contempt for white servants, whom they designate as 'poor white trash'".[4][5]
In 1854, Harriet Beecher Stowe wrote the chapter "Poor White Trash" in her book A Key to Uncle Tom's Cabin. Stowe tells the reader that slavery not only produces "degraded, miserable slaves", but also poor whites who are even more degraded and miserable. The plantation system forced those whites to struggle for subsistence. Beyond economic factors, Stowe traces this class to the shortage of schools and churches in their community, and says that both blacks and whites in the area look down on these "poor white trash".[6]
By 1855 the term had passed into common usage by upper class whites, and was common usage among all Southerners, regardless of race, throughout the rest of the 19th century."