Hipsters love 80s music. Many are avid Def Leppard fans. So maybe you shouldn't be so quick to judge just because their attire confuses you.
I imagine you were also a victim of prejudice in your youth from old fuddy duddies, sneering at your teased mullet, shredded denim, and the tastefully applied rouge. Time has borne out the lasting power of your generation's bold style. Maybe it will do the same for these kids and by 2035 propeller beenies will be all the rage again.