What you seem to keep overlooking is that It’s considerably easier for white supremacists to, again, use mutually understood dog whistles to identify one another and recruit others, than the alternative and what they want because they don’t think it through: to say, their fucked up shit in it’s entirety so there’s no room to deny or wriggle out of it WITH PUBLIC SCRUTINY and social consequences.

Instead, they say “the south will rise again/the civil war was about state’s rights!” which = “Black people should still be slaves!” when decoded. And they’re allowed to say that all day with no social consequences, to have kids and infect them with their bile and tactics for discreetly propagating it further.

Tldr: instead of shouting down Nazis, calmly record their unrestrained discourse, let them go home feeling good, then use those recordings to tangibly destroy any social standing they may have, as was done in Charlottesville. Tell the businesses that work with their employer that they’re doing business with Nazi enablers until that person is terminated, as just one example.

Shouting them down in the square doesn’t make them rethink spreading their venom, only their tactics. Hitting them in their lives with tangible consequences might get them to shut up wholesale.