Best way to combat hate is being nice to the haters. I know that's difficult at times, but think about it: a Nazi or white supremacist is absolutely convinced all Jews, blacks, and minorities are this n that. Then those they have these opinions of actually give them a fair hearing, listen to what they have to say, interact in their threads and treat them with respect. Suddenly all their prejudiced claims are revealed as the irrational and untrue claims we knew they were to everybody else.
"Returning hate for hate multiplies hate, adding deeper darkness to a night already devoid of stars. Darkness cannot drive out darkness; only light can do that. Hate cannot drive out hate; only love can do that. Hate multiplies hate, violence multiplies violence, and toughness multiplies toughness in a descending spiral of destruction." - Dr. Martin Luther King Jr.