It only 'derails' anything if someone decides to pedantidunk on it. That's not conversation. The occasional flight of verbal fancy is, though. 'Calling out' com

It only 'derails' anything if someone decides to pedantidunk on it. That's not conversation. The occasional flight of verbal fancy is, though. 'Calling out' completely mundane things about other people's comments demolishes forums which is why the site docs and zillions of mod comments exhort you not to do it.