I think he was just looking at overall sales numbers. I imagine it would have been difficult for him to check at your school before posting.
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That and I'm under the impression that Galaxy devices do either similarly or better globally, but not necessarily in the US market. In the US I think iPhones come close to matching Android as a whole, of which Samsung is a majority. Obviously any anecdotal survey of a tiny number of people in any small location can have very different results than the entire picture.