When Che cultists show up at rallies, I shout, "Viva, Pinochet!" (Former Chilean president Agosto Pinochet Ugarte has long been a bête noir of the left) or "Viva, Barrientos!" (René Barrientos Ortuño was the Bolivian president whose troops hunted down and killed Che). They're never amused.
If they actually recognize those names than they must be aware of who and what Che was, in which case these people are more idiotic than I thought.