What the hell are you talking about? He's grown up all his life as one thing, and not changing it the moment ONE PERSON misidentifies him as white means he definitely chose his racial identity? This is terrible reasoning.
Disrespectful of your ancestry!? Lol. This is hilariously dumb.
The interesting thing is, whether he's been misidentified or not actually does depend on how he self-identified. He could quite easily choose to identify as white and no one of would really be able to say shit about it without reinforcing the one drop rule.