Do video games and tv really rot your brain

No, playing video games does not rot your brain. In fact, it helps your brain. Your reflexes become sharper and you can think faster than people who don't play them. You can really tell a difference.
I'm not sure about tv though. If you mean a video game, no, but if you mean watching sitcoms and movies and tv shows, I'm not to sure. But in my opinion, you learn a lot about the world from tv. Yeah, they exaggerate stuff, but a lot of that can be applied to real life.
Make sure you do these activities in moderation though. Too much of a good thing can be bad.