Is the expression "white trash" racist toward non-whites because it implies that

Is the expression "white trash" racist toward non-whites because it implies that non-whites or certain non-white races are "trash" by default? Does the expression really imply that though? That is, is it (either the expression itself or the utterance, considered as separate questions) racist if we look at the expression in itself without considering whether a person understands its implied meaning? Perhaps we could also ask if maybe those who don't understand its implied meaning still have an unconscious understanding of its actual meaning and are therefor racist for making an utterance of that expression? Obviously the expression is an expression of class contempt which is arguably as ugly as racism but that's another issue.

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