Actual quiet is very unnatural. Even when away from man made sounds there's still mother nature's noisy ass to contend with. The wilderness is a really loud place as well. With all that in mind, I can imagine why quietness would be unnerving to some, and seeking even white noise (let alone something pleasant like music) would be a comfort.
That said, our concept of quiet is very subjective. What is loud to some will not be loud to others depending on a number of variables including the sensitivity of their ears and the environments in which they grew up and have become accustomed. It's possible some of these people who "need noise around them all the time" don't even notice the noise that's annoying you so. For instance, the people who tap a pen while they're thinking. Mostly they're so deep in their own thoughts they don't notice the noise they're making until someone points it out.