They sound like the Germany CP in the early 1930's, calling the social democrats: "social fascists" and

not uniting with them to stop the Nazis. 

I doubt that O'Brien has the slightest clue about the role of the Social Democrats in the Weimar Republic that was just as culpable for the rise of Hitler. Too bad he interjects his crude insults into this discussion with so little knowledge behind it. Here's my take on the role of the German SP:

https://louisproyect.org/2016/07/14/misusing-german-history-to-scare-up-votes-for-hillary-clinton/