It's an interesting question. It seems that some people think that anybody who disagrees with them, is unpatriotic. I was going to say that they think that anyone who disagrees with authority is unpatriotic - but the conservatives sure didn't think that way during the Clinton Administration, although they certainly agree with the Bush People now.
Other people may not agree with their opponents, but they believe true patriotism requires them to accept diversity.

I work a lot in the Catholic Church, and I find the same is true there. There are some people, mostly conservatives, who have a very narrow view of things and think that anyone outside that perspective is not worthy to be called Catholic (or to receive communion). The Pope tends toward that sort of rigidity, but he's not as far gone as the Bushistas.

-Joe Offer-