Why are so many Bernie Bros staking claims that if Bernie doesn't get the nom they're voting for Vermin Supreme?

Like don't get me wrong, i totally ship the break up of the 2 party system but to go from socialism too libertarian is such an extreme opposite.

Not to mention, Vermin Supreme is struggling for a nomination.... Even Gary Johnson couldn't get the support to do it, and he was the most electable Libertarian probably ever.