Quite a few misconceptions. The some of the worst I can think of immediately:
1)That America is a democracy. How can people actually continue to say that it is? Do people not take civics? Which leads to another point, how many people "in the majority" (read: White, straight, Christian) feel empowered and entitled to extra rights and rights over others. Power hungry fools+ignorance=trouble.
2)That all people who do drugs/alcohol are all low-life losers. And that the mentally ill are freaks. That everyone in jail is a loser. That all homeless/poor/financially struggling are losers. That fat people are losers. These are majorly pervasive attitudes, that people who have problems in their lives are all losers. Many times these are people who really just need some direction, and a friend or some sort of person there to be there for them, or they are people who have just been hard done by society or made some mistakes. They need love and don't get it enough. The mentally ill are ostracized and not loved enough.
3)That sex is for reproduction. Making homosexuality unnatural, abnormal and, thus, immoral, heterosexuality pure, and homosexuality disgusting. Sex is NOT just for procreation. That is basic biology 101. So therefore, every single one of these statements are in-accurate. Every single anti-gay argument is inaccurate.
4)That being religious makes you moral. That religion is a moral standard. And that there is a such thing as absolute morality or normality. I don't think this needs to be explained further, it should be pretty obvious that simply believing in a belief doesn't make you a moral individual.
5)That guns kill people and are therefore bad. That is untrue. People kill people and people are bad.