[Prozac]

I don't think that you should let it affect your friendship.
For all you know, these whole four years he could have worshipped Adolf Hitler, and you might not have known about it. I don't see why you should stop being friends with someone just because they have a different opinion or thoughts upon something to you. You may want to talk to him about his views upon Nazism, he may not even be anti-semetic, he may appreciate other elements of Right Wing politics. I remember that you used to have a communist symbol/quote from Che Guavara in your signature (Im 90% sure it was you, and if it wasn't, someone did anyway) and I dislike communism and che guavara. However, I still help people who have different opinions and political ideologies to me - because thats just it, an opinion. I wouldn't stop talking to someone who I've had a good friendship with for years just because they decide to turn to a different political party to me.