If something is so obvious that it it goes without saying, please don't waste my time saying it.
If you teach writing and have awards for public speaking (?), please don't end sentences with prepositions.
I did not end any sentence in that post with a preposition. FWIW, “it” is a third-person, indefinite pronoun.
While I agree with you in principle, a Grammar Nazi should really learn what a preposition is before claiming someone ended a sentence with one! :)
As an aside, the poster you are referring to DID deserve a dressing down for being an elitist, but you make yourself look dumb by making demonstrably false accusations.