I think I can shed some light on the hatred of the UN. For one thing, it's a joke. The Human Rights Council includes many members who are notorious for violating human rights and will happily condemn the United States and allies. Now, make no mistake, I don't approve of, well, most, of what the US has done since the Cold War began, but I don't feel compelled to defend America from the likes of Russia or Iran.
For another, the United Nations makes a perfect villain to the sort of fundamentalists who read Left Behind, such as those over at Rapture Ready. Even to people who aren't religious, the idea of a shadowy one world government has been a staple of conspiracy theories for the longest time, so the United Nations is the worst fear of the conspiracy theorists (despite being a joke in reality).