Racism is incompatible with a free society.
I gave examples, such as:
Believing that one race is superior or inferior to another
Believing in conspiracy theories that target a certain race (e.x. believing that "the Jews" control the media).
Basically, we can treat racists the same way that Jews were treated in Nazi Germany, or that black people were treated in the era of Jim Crow. I think that society will always tend to dehumanize one group or another, so if we're going to, we might as well start dehumanizing racists, and maybe dehumanization would actually do some good for a change.