Well to defend some of the rhetoric in Greece, when Greeks say "Nazis" they do not refer to the Holocaust (although that claimed a disproportionate number of Greek Jews), but to generalized horror. Travel to Crete for example, and you will see in inland villages, column after commemorative column with the names of those executed summarily, by the Nazi occupation forces. And these are events within living memory of many. Apart from the actual mass killings, murder and pillage, the German occupation was also indirectly responsible for the last recorded famine in Europe AFAIK, where ~300.000 people starved to death, mostly in the cities. My mother-in-law has childhood memories of the cart that went daily around her neighborhood picking the corpses of those starved to death from the streets and the sidewalks, which then they moved on to bury in unmarked mass graves.

So when soup-kitchens form around Greece, and thousands of people go homeless as a result of policies widely perceived to be instigated by the German government, it isn't the Shoah people have on their minds when carrying plackards with Merkel in a Nazi uniform.

The road of excess leads to the palace of wisdom - William Blake