Just saying “I don’t watch TV” sounds pretentious, but there’s a big difference between “I don’t watch TV because I feel that the entertainment of the common masses is beneath me”, and “I don’t watch TV because I’m too busy marathoning YouTube videos of a guy 100% clearing Super Mario 64 without pressing the A button”.
Of course, the notes on this post have amply reminded us of the third category: “I actually watch serialised television shows constantly, but I say I don’t watch TV because I think the means by which I watch them technically doesn’t count.”