Though it contradicts what I just said, I like to quote Samuel Johnson's remark: "Patriotism is the last refuge of the scoundrel." The implication is that if somebody starts calling you unpatriotic for dissenting, chances are he's a scoundrel. Quote Johnson to the dude.

Another interpretation of Johnson's remark is that the real patriots are the weirdos and the people on the "fringe." A recent book with this title (The Last Refuge of Scoundrels--I haven't read it though) argues that the Declaration of Independence gang were a bunch of rich gentlemen -- and scoundrels -- who wanted to protect their moneyed interests.