He didnt demand the displayed answer to be changed or that quizmaster is so wrong. He simply requested something to be accepted, and not even an obscure alternate answer, like "well there is this little village where that doesnt apply, eventhough it is the case for the rest of the world technically it is not correct.
You could also just think of the article coming before "half", e.g. "a half dollar", "a half dozen", thereby eliminating it from your response to what comes after "half".
You could also just stop being silly and go for the answer.
I'm more surprised that centrehalf isn't accepted for football position (or make it more clear that it's the US version called football and not the rest of the world version called football. Also: 50 cents is half a euro.
well ..88.3 but I don't count 0.03 procent of a person ;)