Let alone headphones? You could throw away a pair of AirPods every day and it would still constitute a tiny fraction of what (Americans) produce in waste on a yearly basis.
Corporations don't exist in a vacuum. They have customers they're serving. We don't get to just pretend our behavior doesn't matter because some bogeymen (corporations) are doing worse things, then continue to voluntarily hand our money to those very same corporations.
We (individuals) bear responsibility, too. We vote with out dollars. Yes, we can't control the other 7.7 Billion people on the planet. But we can control our own behavior, and lead by example.
An average shower uses 17 gallons of water. A single pound of almonds uses 1,900 gallons.
Anyway, all this to say that I think the GP's argument is convincing.