The problem is that the SF community has fractured in recent decades, due to huge size. Not to be confused with rifts within one community caused by differences of opinion (which date back past the New Wave/Old Wave rift of the 60s to the Exclusion Wars of the late 1930s), but there was never any question in those days as to where the borders of the community were. If you got published in the SF magazines regularly, you got sucked in, even if you never went to cons. See Julie Phillips' biography of Alice Sheldon for an example of how it happened even to the most reclusive.