So says science.
http://www.psychologytoday.com/blog/millennial-media
Hodson and Busseri (2012) found in a correlational study that lower intelligence in childhood is predictive of greater racism in adulthood, with this effect being mediated (partially explained) through conservative ideology. They also found poor abstract reasoning skills were related to homophobic attitudes which was mediated through authoritarianism and low levels of intergroup contact
http://www.psychologytoday.com/blog/millennial-media
