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The same way you become a "real" fan of any media form. You watch a lot of it and eventually develop your own taste. I can't really figure out how else you'd define a "real" fan vs a fake one. To me a fake is somebody who has no real sense of taste and only watches what he's told to watch. If you're actually a fan then you should at the very least be able to figure out what shows to watch by yourself, based on intuition and prior knowledge of stuff you've seen.
