I have no problem with pride in one's country. I'm very proud of my own country, Australia, not because of what we've done (we're young, so... not a lot), but because of what we are and how hard we try as a country to be generous, warm and just. We don't always succeed but we always try, and that's worth celebrating.
However, I can't stand when people are obnoxious with their patriotism, or believe that they are superior to others simply by virtue of where they were born. Be quiet and dignified with your pride, or expect people to lash back.