This keeps being said but it doesn't seem to register with these folks. Bernie's policies aren't extreme, they are mainstream with Democrats. Not all, but most, which seems to grate on the mono-culture that represents Bernie's supporters in 2016. The Democratic Party is a coalition of different groups, which is maddening to the white liberal crowd that is the core of Bernie's support.
I note that the "Our Revolution" reform effort has a number of people that are black, Hispanic and Muslim. In this, I see a lot of hope that the reform effort will be more than the kind of idiot who says that we should "kick social justice warrior to the curb" and "we should stop talking about race in order to part of the problem".