totally agree. Everyone knows everyone but may not hang out or associate with them. you might call it a passing acquaintance such as oh, yeah that guy is whatshisface, you, soandso's cousin/uncle/kid/brother. I don't really know him but know who he is sort of knowing someone.
I feel she may have been focused on her life and her future and may never have bothered to notice those who were not.
I think the A-train knew Holly as a stuck up stuck on herself little you know what. Not because she was one, but because criminal drug addict thugs going nowhere almost always view girls like Holly in that light IME.
People like this group of meth=heads are the type who blame the world for their own shortcomings and people who get attention for having it together are usually known by, resented by and vilified by people like the A-train and their little minions for that reason.