Similar to this, but with even less justification, is the use of the plural pronoun with the antecedent anybody, any one, somebody, some one, the intention being either to avoid the awkward "he or she," or to avoid committing oneself to either. Some bashful speakers even say, "A friend of mine told me that they, etc."
Use he with all the above words, unless the antecedent is or must be feminine.
The Elements of Style
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William Strunk Jr.
