They also just hate muslims more. But the real kicker is how in their worldview there's good and bad jews. Good jews are genocidal ethnonationalists, implementing policy that the fascists want to implement in their own countries. Bad jews have basic human decency and are to the left of Hitler. Therefore, their antisemitism has a perfect outlet since the idealized other is faraway in Palestine, while the idealized enemy is at home.

Only a minority of fascists feel the need to claim that there's a zionist conspiracy to keep them from being ethnonationalist like Israel. Most of them are content in claiming there's a non-zionist yet jewish conspiracy to do the same.