So salty! And yet...How's ETH Classic doing? It was the right move at the time to fork. And pretty obviously would be the wrong move today.
For context, guluarte is referring to a moderately contentious hardfork done by the Ethereum developers and mining community to reverse TheDAO Hack in 2016 or so. The stakes were much larger then -- Ethereum was newer, not yet battle tested, and TheDAO had something like 10% of all ETH in it.
A fork was formed -- "ETH Classic" -- ticker ETC -- which did not reverse the DAO hack, and you can see from valuations that the public preferred the reversal.