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It really annoys me how many supposedly progressive and leftist people use this term without realizing its implications.
1) It's racist against non-white people. If you call somebody trash, and stress that they are white trash, it implies that it's somehow a norm for white people to not be trash, and that the "white trash" somehow falls out of that norm, as well as that people who aren't white somehow comprise most of the "trash" category.
2) It's classist and elitist. Because making fun of the poor, undereducated and ignorant really shows your social justice cred like nothing else, am I right?