Ah, I've seen this concept before. This is about ingroups and outgroups.

The Western Right's outgroup is people who aren't Westerners. BUT the Western Left's outgroup is the Right. The real enemy is Western civilization and specifically white people. This is the best explanation I've ever heard at this link. A bit long but worth reading every word because it answers SO many questions.

http://archive.is/QRJ6m

You will notice that this comic, while being leftist, punches down and attacks the little people. There's no excuse for punching down. You punch up. What you don't do is make a joke at the expense of the less powerful or more oppressed group.

Punching down is a concept in which you're assumed to have a measurable level of power and you're looking for a fight. Now, you can either go after the big guy who might hurt you, or go after the little guy who has absolutely no shot. Either way, you've picked a fight, but one fight is remarkably more noble and worthwhile than the other. Going after the big guy, punching up, is an act of nobility. Going after the little guy, punching down, is an act of bullying.

This is perfectly explained by the ingroup/outgroup concept. The Leftwaffe would obviously never do this to anyone but The Other.