[k3n]

Good points, and you're probably correct.

However, to your last point, I can see how it'd be challenging to convey your stance that you won't allow uncivil discourse other than how he did so. If you go ahead and respond normally, you're just reinforcing the bad behavior, ergo it makes the "discourse must be civil" an empty promise/threat. Perhaps he could have replied, with a caveat that further uncivil posts would be ignored, but I can also see getting tired of that sort of behavior (and as a former forum mod, continually having to 'remind' people of the rules that they've already agreed to wears out really quickly).