Because now, putting headphone on your head is the universal sign of “dont fuckin’ disturb me.”
It doesnt matter what kind of headphone and music you prefer to enjoy with. I agree that some people have somekind of “feeling like being tortured inside ear” by noise comes into your head. It might be sound (I prefer call it noise) from people’s chattering or/and that noise you’ve always heard for every single day and night from that room’s cheap audio system. All of that noise are going bigger, stronger, and louder as day goes, now it feels like I’m doing earring for the very first time without using anesthetic at all.