Why are you taking that warning out of context? That was generalized towards people arguing over the 10man tag usage, not Rabid's response.
Rabid's response to that is purely derived from the fact Hong not only participated in the argument, but decided to carry it on. To carry on an argument for as long as he did then threaten to end it by using his discord powers is extremely childish and borderline a power trip. It should have never happened in the first place.
An argument is an exchange of opposite views with the attempt for parties involved to reason with each other. Saying an argument will get you nowhere and that people will "stick with their ideologies" is both false and projecting your own opinion.
Chat spam is meaningless and pointless messages, an argument over certain policies is not chat spam (xD).
You accidentally permanently muting him wasn't even the problem. The fact you muted him in the first place was the problem, and people even agreed it was unwarranted.
If you actually believed the mute was deserved you would have proceeded to fix your mute to be 30 minutes. Instead, you decided to stop talking and not mute him at all (wow this probably should have been done by staff during the argument).
If you're going to be staff please don't be so sensitive. Yes, Rabid's comments were unnecessary but your reaction to the severity of what he said screams you are emotional and can respond irrationally if rubbed the wrong way.