I’m not sure I agree that an anonymous person offering an (uncomfirmed) opinion behind a screen name qualifies as making a public statement. And I do not believe Halacha differentiates between “stating what feels wrong to you” in public and attacking.
Actually, since no one appears to have asked for your specific opinion (certainly not in public), I think we could call your reaction a (well intentioned) sensitivity to Shabbos as opposed to clear outright Hilchos Shmiras Halashon.
I would strongly suggest that you ask a shaila before continuing, and at least have a warning be added to the thread title.