I appreciate your attempt. Clearly it has been boiling your blood for a while.
Was it too harsh? Eh, maybe.
But as your closing thought states, if only person gets that "aha" moment, then you have helped society in general.
Most of my permanent corrections have come through some sort of public ridicule and embarrassment. Sad fact of life for me I guess.
That being said, I am beyond grateful that members of this forum spend time with me helping out with issues I find difficult that they probably consider grade school logic to them.