We can, via laws. In the US, there are anti discrimination laws for protected classes in some areas. You won't find that Nazis are a protected class, but if you

We can, via laws. In the US, there are anti discrimination laws for protected classes in some areas. You won't find that Nazis are a protected class, but if you would like them to be you can run for office and try to pass a bill and see how the free market plays that one out for you.