And yet again, "They" aren't the ones being supported by these guys:
That would be the "Unite the Right" rally. So, unless you can supply photos of real live, goose-stepping, schwastica waving, heiling NAZIs marching for the Left, your comparison is invalid. The Nazis chose their side.
Also note, the other flag is the symbol of separation from, and declaring War on America. (Not counting the Gadsen flag in the background. That was against England.)
So, since pattern recognition doesn't seem to be your fortissmo, that's what a Nazi looks like. I'll just assume the patriot got lost, and wound up in with the enemies of America flags collection