[bobman0330]

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From the Dictionary, definition/usage of their:

"(used after an indefinite singular antecedent in place of the definite masculine form his or the definite feminine form her): Someone left their book on the table. Did everyone bring their lunch?"

Bottom Line: The use of "their" is grammaticaly appropriate following the use of the indefinite singular antecedent, "this user".


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Two things:
-First of all, "their" is not right as an indefinite gender pronoun. Citing "the Dictionary" does not convince me otherwise.
-Second, "his or her" is meh. Give me an old-school "his."
-Third, come on, it's 2+2. It's not really indefinite gender, it's a guy.