The simplest thing for Soatok to have done would be to ignore the message
Which also happens to be the simplest thing you could have done, even simpler as none of the toots you quote were addressed to you. Instead, you are dragging this one random exchange into this thread about something else entirely.
Does it really matter whether or not it is addressed to me? And, the simplest route is not necessarily the most virtuous one. To take an extreme example, if I see someone being bullied I will interfere to stop the bully and console the target. Here, I am simply arguing in favor of less toxicity for it improves credibility.