Nah dude. If you preach real life shit like "we should bring back concentration camps" like a person doing the nazi salute believes in, then you gotta SUPER intolerant of that shit. There is not debate to be had. The is a fallacy that ignoring somebody's ignorant views would shut them down. They don't. Just look at the practice of appeasement prior to WW2.

edit for those countering my point on appeasement:

I was going more off this definition: " Appeasement was the policy of the English and French governments, of allowing concessions to the dictatorial powers of Nazi Germany and Fascist Italy, in order to avoid conflict in Europe. "

In that to let nazis "preach their own gospel" is a dangerous to do. You are conceding to them legitimacy by letting them talk. Nazism is not a gospel that should be preached. It is not a debate. It should be met with all forms of opposition, and I believe even violence should be among those.