I'm a liberal, but I mis-trust sentiment, and believe in trying to do the right thing in cold blood, not for anyone's sake but your own.
I think pc diversity is a bit of a sham, sometimes. The differences of people in remote cultures are so much cuter than the differences in our stupid next-door neighbor. Unless you're pretty darn serious about it it's just touristy and sort of cheaply pornographic to get too flirty with culture you don't really live with. It's important to study your own culture, all the boring old junk, to have something to bring to the potluck.