I'm happy to say I have not encountered this in Bass River SF. Must be those northern NJ types doing it. Gross. Today I picked up: 2 empty cigarette packs, a mylar balloon, Dunkin' and Wawa coffee/drink cups, several unhealthy sugary drink cans - empty, plus the usual random paper and plastic bits. Not really a lot considering the distance I covered, roads and trails and parking lots.
Also several whole or partial official State Park Service signs - Closed due to COVID-19, Limited Opening, No Swimming, etc. (That's the life cycle of a State Park Service sign: They put them up, people or weather take them down, and I collect the bits from the brush and it goes in the trash.)