You're forgiven, so don't worry about it, but you didn't upset me. I was just providing more evidence about my reasoning that the use of counterexample via sub

You're forgiven, so don't worry about it, but you didn't upset me. I was just providing more evidence about my reasoning that the use of counterexample via substitution really does go as far back as ancient Greece, why that still applies to modern people and explaining why it seems more plausible to assume the original poster was employing a refutation technique than to assume otherwise.