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They are all sedentary activities, which are seen as lazy. You're right that they can be very productive, like watching educational programming or the fact that videogames can help with hand eye coordination, decision making, reaction time, and be social activities. 
But they all involve largely sitting g on your ass not moving, which is pretty lazy.
Unless you're playing wii sports or some augmented reality VR that has you up and moving, I guess, or you watch movies while on the treadmill or exercise bike.
None are lazy or unproductive, you can do them lazily or unproductively.
It's all about how you engage with it and what you get out of it.