His original, fairly innocent, blindingly obvious (to everyone but you, evidently) comment. YOU starting the name calling. YOU being patronising. Harsh, but fair given what he was replying to, followed but a great point explaining what he meant. i.e. it makes more numerical sense to count from the smallest unit up. "Are you American?" was probably just a question asked because you were jumping on a small dig at Americanisms. I didn't PM it, but you clearly needed it explaining step by step. Clear?