He never mentioned that he was Russian before I made mention of the misspelling, so you are wrong. It has nothing to do with arrogance. Whether he's Russian or from Brooklyn, it never hurts to learn. Anyway, there are many American members here who make grammatical and spelling errors way worse than that.
Members here who have specific knowledge of things like tubes or crossovers are always a source of learning for me, and I am grateful to them for that.