I don't think fascism and nazis are interchangable 1 to 1, iirc fascism is either a system of government or ideology. while the nazis are a type of fascism. all nazis are fascists but not all fascists are Nazis.

but i can imagine most people stopped learning about history in highschool, so i imagine that when they hear fascist they think nazi then immediately the nazi's extreme disdain for jewish people, so to have a person who is jewish in the company of nazis is enough cause to wave away concern. In terms on the zionist entity i imagine they wave it away because to have a jewish entity acting in a fascist way is oxymoron from their point of understanding history.

they kindof used that plot in the hbo series "the plot against america" with the rabbi vouching for a vaguely anti semite dude for president