Who is being deliberately obnoxious?!! Correcting a fundamental misuse of language is a normal part of discourse. This is not a grammar or typo challenge, and it is inaccurate to state that it is. Correction should be appreciated. We can all learn and improve.
I understand that a few are such sensitive souls that they feel that they should never be challenged, indeed if anyone does so they call them trolls! But that's their problem.