It seems to me that people who are worried about being PC are worried because they don't actually KNOW or talk to the people they don't want to offend. In many cases it's a form of discrimination in itself, because they spend time thinking up "non-offensive" terms rather than admitting it's impossible to lump a group of people together and have one set of criteria fit all of them.

One of my high school teachers vehemently forbade her students from referring to her as African-American. she said she had no more connection to Africa than any other American whose family had been in this country for more than a hundred years. She wanted to be referred to as an American Negro. And my best friend hates to be called called Hispanic. It's Latina or nothing, baby! I personally, like many Americans, am a mutt, but mostly Scotch-Irish...does that make me a Celtic-American? *grin*