> This habit of using headphones to dodge uncomfortable interactions may be especially common among younger adults, for whom social unease and feelings of isolation are well-documented problems that have become more common in recent decades.

Earphones (not specifically apple ones) are great for this. My city has become a touristy hotspot in the recent years, and you can't walk 50 meters through the city center without some homeless guy, or a romanian woman with a baby asking you for money, some "finnish" guys trying to sell your their music cd (that you have nowhere to insert anymore), some scammer offering you a flower or someone trying to sell you a boat tour of a city you've lived in your whole life.

Earphones in and you don't even have to reply, just ignore everyone.