OP many are wearing iPods, or earbuds connected to phones. But have to say if someone is wearing ear plugs you may be confusing them with earbuds.
Earplugs would be mostly in ear, or at least the multiple ones I have come across are. There are noise canceling headphones by Bose. Very effective, our youngest highly recommends them to those in a spectrum range to control loud noise.
Noise levels are a personal issue, only a few times a year does a poster find the bands too loud. I find the crowds and personal conversations sometimes can overwhelm the music. But it’s a personal thing
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Do not worry about things you can not change 
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