Unfortunately, depending on the specific justifications for his racism, its really hard to "argue" someone out of beliefs like that, since he can just block out all your info as being either naivety, or straight up ZOG propaganda.
The best way for someone to get out of that sort of belief hole is just for them to meet and befriend blacks and jews. And that's hard to do if someone is virulently racist.
Can you talk a little more about his actual beliefs? Because the road to deprogrammed from will be different depending on his specific psychoses.
He's a Syndicalist who hates Jews and black people
Oof, that's rough.
Unfortunately, depending on the specific justifications for his racism, its really hard to "argue" someone out of beliefs like that, since he can just block out all your info as being either naivety, or straight up ZOG propaganda.
The best way for someone to get out of that sort of belief hole is just for them to meet and befriend blacks and jews. And that's hard to do if someone is virulently racist.