Ignoring one who disagrees with you is clearly a form of polemic. I know this from experience. It’s a passive agressive tactic that can be very effective. Noam Chomsky has had plenty to say about media manipulation of political information over the years, and this is a shining example. Bernie Sanders deserves to be heard, especially since he has such a substantial following among the working class and poor in the US. From our friends over at naked capitalism.