You may not have said that explicitly, but it seems everybody (including me) thought that was what you meant. Wouldn't you think that
after the original question means, "'Him' is corect. 'His' is incorrect?" (This punctuation thing drives me mad. How can what I just wrote be correct? :-|)
It often happens on these forums that someone asks, "Which form is correct, A or B?" To my understanding, it is customary that when someone answers "A," it means that A is the correct answer and B is the incorrect answer. Otherwise, we would expect some comment, for example: "Both are correct, but A is preferred where I live."