Reading this thread, I still don't really get the difference between "values" and "principles". I mean, should your values (how important you hold things) really be so different from your principles (your general rulebook/guide on how to act)?
But really, my gut reaction to generalized gut reactions that I disagree from people I don't know very well is a torrent of ranting. Using lots of "-ist" words. ("Sexist" is my favorite, though "elistist" probably isn't uncommon either.) Ironically this incredible reaction is usually based on me drawing perhaps unneccesary connection, connecting the person making the statement to the whole subset of people I might imagine making that sort of statement.