Dave wrote:

It is indeed a matter of the language's nuances. I was being mildly
sarcastic about the poster's comment. Phrases like "Don't be a fool" are
designed pompously to puff up the person making them, to convey his own
sense of his importance, and to belittle the person to whom they're
addressed. They don't add anything of substance to a discussion. Hence my
sarcastic note.

That I understood, so your last clarification was unnecessary. What I
didn't understand in your post was the dissuasion part, it made an
impression on me as a "light version" of calling me a fool, somewhat
hidden but equally paternalizing. Can you falsify this observation ?
But don't be alarmed too much, I sure could live without it.

Len.