This is why I want 'dumb' TVs. Unfortunately these days, only the bottom end ones are available without smart features. You want 120Hz, you gotta take our apps.
Solution is to not hook up the internet port, don't connect to the wireless network, and if possible, disable the smart features.
As I and others have said before, you probably already have other ways to get netflix. My main set can receive netflix from the TIVO, the Roku, the Chromecast and the BluRay player.