His motivations are different. He’s not motivated by anti-Semitism - he opposes ANY aid to ANY other country, and believes in putting America first. White supremacists specifically don’t want to aid or abet Israel, not any other country as Ron Paul does. It’s similar to how he may agree with leftists on the war, but for different reasons - he opposes ANY interventionist foreign policy, and wouldn’t support their pet causes like Darfur.