I am 63 now. For the first four decades I did not practice or witness racism. I had friends that were Asian, Hispanic (at 16 I was the only gringo in a Hispanic Band), and my best friend for years was a black guy.
For the last twenty years this has slowly eroded not because I have changed. The Rats have pushed us back to the 50s if not the 30s.
Obama has made a lot of us reassess this idea of a color blind society. All he had to do was not make everything about race, and he couldn't even do that.
He has made a lot of people believe that you aren't going to be allowed to be colorblind.
Also, by being a complete bungler, he has reinforced racial stereotypes that he would have eroded had he behaved in a sensible manner. His arrogance and stupidity have had the effect of making the racists look correct.
Obama has been a disaster for race relations.