Please tell me what he's saying then. It seems pretty clear to me. He should've never said the N word but whatever...
The song is about people being inadvertently racist by imitating another race. In one verse, a white man wants to sing the blues, but he thinks he can only do this if he lives the lifetsyle - i.e looks, behaves and talks like an outdated stereotype of a black man. In the second verse, a black man who used to be a radical of some sort (hence the mention of a daishiki) is trying to insulate himself from racism by "becoming a caucasian", which means rejecting an arbitrary selection of black lifetsyle icons (i.e not eating pork and greens!) and mixing with the worst of white society (whilst playing golf).
Zappa is still saying these stereotypes are attributed to being black and being white and therefore perpetuating them.
Bottom line, my statement above has nothing to do with Frank Zappa. It has everything to do with attributing pork to Muslims when it can be attributed to Christians as well. Pork was only said because the terrorist was Muslim.