1. Pick-pocketing hippy thug lot kids (i.e. the obligatory 8ft tall guy with dreads and the backwards new era fitted) who travel around from show to show, leeching whatever they can get, selling bullshit RCs as Molly/LSD, stealing shit from peoples cars, basically bottom-feeding hippie thug scum. If you've been to a Phish show especially on the east coast in the last 10-12 years you know the type. I dont know what subculture they fall into or what drugs they do (hubbas probably) but i despise those scumbags. They add nothing positive to the scene or to society as a whole. The world would be a better place without them, as fucked up as that sounds...
2. The crust-punk "summer addicts" that live in Thompkins Square Park. NY'ers know who im talking about. Hundreds of them appear out of thin air in the summer and stay until October. Usually dope, coke, and alcohol. They aggressively harass everybody and anybody for anything. you can't even smoke a cigarette within blocks of the park without a pack of 5-10 of them trying to shake you down.
last but not least...
3. Know-it-all drug users. Sadly, most fall into the psychs/RCs category.