Let people do what they want. If someone wants to enjoy music on their bike, fine. This coming from someone who doesn't ride with headphones in, but only because I was never one of those people that had headphones in 24/7. I always felt music distracted me from the joy of riding a bike (or the pain of riding a bike, when it comes to training.) or that bike riding distracted me from the joys of listening to music. But irregardless, other people can do what they want.