But you can't deny that he's right about far-right extremism.  It may not be on campuses, but it's in the streets and it probably will be on campuses in a few years.  A handful of American campuses already have some "alt right" groups; Richard Spencer has speeches planned at Texas A&M and the University of Michigan. Identity Europa has let it be known that they want to recruit college aged white people.  Flyers produced by "Unamusement Park: ("Why White Women Shouldn't Date Black Men", "I am George Zimmermann", "There are Innate Race Differences in INtelligence", etc.) have made the rounds.  
Apart from extremist attitudes to being nice, which are in short supply, there is no good extremism.