Calling someone you are angry with a "Nazi" is pretty typical of Israeli hyperbole. I can remember a 12 year old kid, whose younger brother "borrowed" his marbles and lost them all in a game, calling his brother a Nazi (and a few other things too). That's Israel. I think that for a WP article it would be better to stay away from words like "Nazi" for anyone who did not actually belong the the Nazi Party, or declared such sympathies.