I read the Pournelle threads linked. To save others the time: it's clear from the messages that the people writing them didn't like him. It's not clear to me what he did that they considered abuse. The most concrete things: something about trying to access MILNET apparently unsuccessfully; writing in Byte about his experience with the lab guest account; saying ARPANET instead of internet.
I can believe the guy was abrasive, but I regret wasting the time trying to find out specifics.
I can believe the guy was abrasive, but I regret wasting the time trying to find out specifics.