The fact is that in practice, it's either headphones in or out when in public. Meaning wearing them all the time effectively means IRL Do Not Disturb.

> I think we need regular doses of real human contact — not just with close friends, but with acquaintances, and even with strangers — to counterbalance all the negativity we encounter in the news and online, and to remind us that, on the whole, people are kind and well-meaning.

I think the author may have a point here, but he'll be hard pressed to convince anyone to give up the benefits of 'sonic isolation' through music and noise cancelation that people seem to have discovered.