Why arent they responsible? Having a phone and changing phones every new model seems pretty wasteful (obviously not done by 100%) and damaging to the planet. As does having televisions in there bedrooms, computers, tablets etc. These are only things the millenial generation and after have had in wide occurrence in their own personal spaces.
Millenials are for the most part the offspring of baby boomers who are well known for their waste and excess and they where the yuppies, your aware of them right. Millenials are no less guilty than any other age group.
The fact that millenials are mostly the offspring of baby boomers suggests they participated in the same lifestyle that boomers have lived. So not their fault to be spoilt in ways they take for granted but hardly blameless. You may like AOC but to most she doesnt really cut it in the intelligent debate department.