I can understand a lack of interest in metal based on speed, distortion, vocal styles, even lyrics. There have been times when I've stepped away from listening to metal for a while, a few months here and there, and I've been put off by its abrasive qualities when I start listening again. Especially if I've been listening to stuff with a lot of dynamics. And of course the opposite holds true: when I've been listening to metal for a while, I'll toss on a rock album and be like "what is this slow, boring, predictable garbage?"