Well he's clearly just trying to make a point. But I'd say it's a legitimate one. I should be able to study and admire Nazi or Mongol military tactics without automatically being branded a Nazi or Mongol sympathizer.
The Nazis being louder and more out in the open than before is new.
But if someone else says such a thing, interpret what they say in the most charitable way possible and move on.
Really, move on guys. Don't make a mountain out of a molehill, just move on. Yes indeed I know you are not a Nazi sympathizer and I'm moving on.