> If we turn our back on the voting population
I don't see how refusing to patronize 1 nazi is "turning your back on the voting population". Especially when the voting population doesn't like nazis. It's more like embracing the voting population.
Which votes are those again? In the USA, which we're talking about here.
If refusing to patronize 1 nazi means the far right gets more voters, we would expect to see that in USA election results over the last year or so.
Fortunately, this hypothesis is not borne out in the data. In fact, I'd say your purported correlation is inverted, but I suspect there is a deeper, correlated variable: "doesn't like nazis" -> ( "doesn't vote for nazis", "doesn't patronize nazis" ).
Pretending these people don't exist might feel nice but ignore them at your peril. If this is what "Nazis don't vote" looks like - what would it look like when they start?