A netizen is an inhabitant of the internet. Everybody knows that today. Back in the golden times of the internet a netizen had to be an expert. A navigator through a new world, a world that existed only for the technologically adept. It comprised dark corners and caves.
Dark corners do still exist today. If you want to explain to paranoid technophobes why the internet is cute and harmless despite cybercrime you ought to say: It is just like the real world.
So everybody is a netizen. If the Know Everything oracle (Google) does not find any content related to you - you might be something special.
You might be a Realizen probably.