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At worst, he made a mistake. Nothing in his post sounded like "trolling."

And either way, your reaction was excessive and uncalled for. Try giving someone the benefit of the doubt and if you must correct them, do so politely the first time. If they persist, then stronger language may be in order.

There is nothing gained from coming right out of the gate spewing insults and rudeness. That's a lesson I learned the hard way over the last 20 years, and I'm passing it on to you for free.