We're not just stupid, we're backward-thinking. We have such outdated morals, thinking homosexuality is a sin and abortion is murder, for instance. I mean, those ideas are from like the Dark Ages or something. /sarcasm
It is also used to defend why schools employ largely liberal staff. Even the Houston Comical runs several idiotorials and letters every year claiming that "educated people have to be liberal because it is the only logical position to have on the issues".