*My feeling is that its inappropriate.  We're trying to build a legitimate encyclopedia, so an epithet is not necessary.  It could open up a pandora's box where we list all slurs on the relevant subject pages?  Not a good idea.  Regarding "white trash" being different from "nigger", there's not much difference. 

 Wikipedia: White trash (extended: poor white trash; acronym: "WT") is an ethnic slur or racial epithet usually used to describe certain low income persons of European descent....."