4chan partially solved this problem by using inside knowledge to identify 'newf*gs' and push them out. Triforce, fingerboxes, etc. The weirdly complex boardculture was self sustaining because new people couldn't even keep up with the conversation without lurking for a year or so.
And then of course, the newcomers started taking the abrasive and politically incorrect culture at face value.
And then of course, the newcomers started taking the abrasive and politically incorrect culture at face value.