1. Separate User Profile.
Why would they insist on creating separate logins and still watch the same shows? Their instant cue doesn't consist of sub-par filler like Ice Road Truckers, Derek and some crappy, slow-moving British police drama. It's House of Cards, Sons of Anarchy and Mad Men! Worst of all, when you click on it, they're on Season 4. How is that even possible?
2. Backseat Watching.
You can't even get through an episode without them condescendingly saying things like “wait, you have to watch this part," “well, okay, if you think so," or “seriously, you're going to go to the bathroom now?!" It's almost as if they've watched this before. Because they have!