1 out of 5 americans thinks that the Sun revolves around the earth

My friend was in NY for three months doing a training, and he told me, from his experience with Americans, that Americans have the attitude that they are superior to the rest of the world, in terms of culture, administration etc, and now they have taken the responsibility upon themselves that they have to reform the world, and do favours to the backward people. Isn't it really ironical when one out of every five Americans thinks that the the Sun revolves around the earth.