Sooo... This is happening on Imgur

That's a problem you should fix.

Well, if they wear the flag, display the Swastika, do the salute or go on about white supremacy, that's a pretty solid hint.

A Nazi is (originally) a particular brand of fascism, but much like champagne, it has become a generic term for the whole family of ideologies. The "ur-fascist" definition by Umberto Eco, who was witness to the fascist regime of Mussolini, highlights a few key traits if fascist ideology like a cult of tradition, emphasis on machismo and action over thought, obedience over independence, contempt for pacifism and weakness and populism that leverages frustrations, conspiracy theories and fears to rally its followers against some perceived enemy.

Not every trait is fascist on its own, but neither does some movement need to tick all boxes to be fascist. There's sure to be some grey area, but if you have people rushing to inflict violence on anyone looking differently, spurred on by a guy promising to restore some ambiguous past glory by blaming the economic and social troubles on foreigners and beating the war drums... yeah, well, eventually the indicators start piling up.

A lot of people get called "idiots" but that doesn't mean I can't actually differentiate who's really an idiot.

(There is a subtle subtext in this reply, see if you can catch it.)

Wikipedia would probably be a good start then.

Aww, were you educated in the south or Midwest?

are you a sh*tlib?