In its original iteration, the Nazis were very much not accusing their opponents of such things. Fascism is very visible, with displays of strength, mass events, iconography, etc. They concept of the enemy was more conspiratorial in nature, i. e. the jewish conspiracy.

It's really only the most mindless middle school name calling of the last two years or so where you get Trump people saying "oh, but it's national socialist" and now Putin. It's trolling, "flooding the zone with shit". The Nazis were better than that.