Overheard at a pro-Israeli counter-protest:
Admittedly, that was just one guy yelling that scary crap, though nobody called him out on it.
He was not, however, the only one calling the Jewish protesters "kapos". The word "kapo" refers to death camp collaborators.
(Credit to Max Blumenthal, by the way.)
Edit: Meanwhile, here are some other Israelis whom, I'm sure, these guys would call "kapos" as well, who are continuing to rally despite right-wingers throwing a smoke grenade at them:
The speaker stopped his speech when the smoke bomb was thrown to start singing "no to fascism" along with the crowd, who appeared unperturbed by the fact that they were ringed by right-wing football hooligans.
Good for 'em.