While exercising, I watch The View. Does that count as stupid? Your call. But I'm going to start exercising earlier because I discovered that The Daily Show and The Colbert Report, which definitely aren't stupid, are aired in the hour before The View.
Otherwise, I only watch a couple of hours of TV a week. And there's more than enough interesting stuff on TV to fill that time that I don't have to resort to stupid shows. I very rarely watch anything I don't specifically set out to watch. I'm not a TV snob. I actually think there are lots of really great shows on TV!
I can be susceptible to stupidity, though. I've only had cable TV for a couple of years, and early on I discovered that I can easily get caught up in shows about celebrities' most idiotic moments or shows in which they try to put together a fashionable outfit in an hour for less than $100. Potentially I could spend all my free time doing this. So I rarely watch cable TV at all.