How are Jews not white?

I can understand white supremacists hating people of different skin tones, but how are Jews different than whites?  It seems to be more of a cultural hatred than a color based hatred.  I consider Jews as white people the same way Russians, Germans, Polish or French would be classified as white.

white supremisists usually hate catholics too. 99% of them are concerened with more than race. You have to be white AND Protestant otherwise you're the enemy.