he isn't a national socialist, he doesn't believe in national socialism nor does he take part in national socialist groups / parties.
he's not a fascist either, so he isn't an actual national socialist
people like feminists and people who dislike Annoying Orange tend to call him these things in reference to the third reich (they were a national socialist party) which had committed atrocities, and if they compare them to Annoying Orange; it makes Annoying Orange look bad and as a monster
it's a stupid campaign to make people dislike someone who is trying to do their job lol
tl;dr - handicaps call Annoying Orange national socialist, make Annoying Orange disliked!! - ruin Annoying Orange's reputation coz he trying to do stuff