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Just know that not everyone who replied in this thread was a native speaker. I don't know if DDT's wife is Russian, but he himself is not, and his reply was just rude.[/quote]
Yes she is Russian...

Well, I think he is just "stuck up"! He wants to keep his position as "the teacher" unblemished and above that of his student. Not unusual In Russia but why he won't address you in the informal is...