When to say, "Shut up, you're only revealing yourself to be an idiot."

Yes that's right, sometimes it is OK to be rude. I've said this before, but when people make the comment, "But will South Sudan be viable as a land-locked country with no port and the lowest literacy rate in the world...?" You have to say, Dear Sir or Madam, South Sudan already is a land-locked region with no port and the lowest literacy rate in the world, and it currently is part of one of the most messed up countries in the world, and so yes things can get worse, or things can get better, but whatever your completely bizarre notion* of viable wouldn't even stand up to thirty seconds of scrutiny... explain what you mean, in English, Arabic, Dinka or any other language, just not in a platitude!!!!!

*Usually it turns out to be something like: a new country that has a giant wall all around its borders and maybe even a moat with crocodiles thrown in for good measure...