For my part I tend to be much more offended by comments that are deliberate and still manage to be vicious than I am about someone making rants that are easy to realise are not made with sound mind.
If what you had written was a brief warning about his rants, then that would have been fair enough. But what you wrote was not a warning.
That's a reasonable and nuanced criticism not of what I did but the subtleties of how I did it. You are entitled to it. Other than to suggest someone reading what I wrote would not be warned, I think that over reaches your point by a margin.
I am similarly entitled to note that you did not write such a warning in whatever style you advocate and neither did anyone else. I'm comfortable standing by my noting his behaviour is unacceptable, because it is.
If what you had written was a brief warning about his rants, then that would have been fair enough. But what you wrote was not a warning.