Please don't call people out for minor mistakes that the principle of charity (http://en.wikipedia.org/wiki/Principle_of_charity) can easily explain. Even when you're right, it usually adds more noise than signal.
It's easy to consider that omnibrain might be a non-native English speaker who isn't up on the distinctions between "country", "county", "state", "province", and the like. His or her meaning was clear, in any case.
If you do think something is important to correct, please edit out personalized language ("for someone...nitpick...you seem") from the correction. That too adds noise, plus detracts from civility.