I've been noticing this more often when out running. It happens at races but even on day to day runs. People are running with their music and no in-ear or earbud headphones. They have their musical device just playing on speakers. Really? Stop the noise pollution! Why do you think I want to listen to what you are listening to especially at 5:30 am when i am normally running? Wear your earbuds!
Are people doing this because they are trying keep awareness of what is going on around them? If so, i have a secret. Turn down the music just a notch. It'll be better for your longterm hearing too. Or try the radical idea of not running with distraction. Hey I like my distractions too at times (I prefer audio books checked out from the library) but I also enjoy just running with my thoughts and staying connected with my running.