When we say "myth" it's hard to know how much reality grounds it. I think that scene exists for people with extreme social stamina. They go out at 6pm and are okay coming back at 4am. All night long they're with people, on a regular basis. It sounds rather exhausting. And I'm not sure how you'd get any work done, even though these are frequently artist- or writer-identifying types. Some of them (e.g. Gasda, Crumps, Kaitlin Phillips, Nathaniel Otting Weaver) make their social network the basis of their art, or their art itself.
They're on the packet mate