What exactly is post racialism?

What exactly is post racialism?  
         

In chapter 6 of the Philosophical introduction of Race by Paul Taylor, he talks about the topic of post racialism. Post racialism a term used to describe a society in which discussions around race and racism have been deemed no longer relevant to current social dynamics. This especially came into effect after the election of Barack Obama as the United States of America president. The election of Barack Obama to the presidency of the United States brought questions about race in America to the forefront of political and social discourse in novel ways.

Since, Barack Obama has taken the presidency in 2008; he has been used as a figure head for the movement of post-racialism. Many people argue that racism is over because we have an African American as president in fact those people are wrong. Many Americans rejects the overt practices of racial discrimination and hierarchy that have marked the nation’s history. Post-racialism also picks on minorities who have been subjected to such discrimination to themselves. In which they become race-neutral and start to refrain from appealing to the history of racism. Instead Barack Obama took it upon himself and commented on the killing of Trayvon Martin, Many of the president Obama critics believe that he had known right in talking about the tragedy of Trayvon Martin. President Obama was reported saying “If I had a son, he’d look like Trayvon,” Many people targeted president Obama for invoking race, with some people stating that the presidents comment was disgraceful. My essential questions are there such thing as post-racialism? Why do a lot Americans believe that we've moved on passed the racism era?