By one of you, you mean a literate person? Thank you kindly, sir.
Say you notice an idiot trying to cross the street, however a car is coming. Do you tell him to watch it? You do. Now, you made a mistake, I pointed it out, in an attempt to help. Not sure what qualifies as trolling. I never understood this term, nor do I see its purpose.
See now, a man will show his true colours when cornered. Be humble, polite, righteous. It won’t hurt. Own up to it, you make mistakes when writing/typing in your maternal language. This is shameful.