Erm, it's not just an "accent". Sure, he makes racist sounds, but he also clearly specifies that he's doing it in response to people he perceives to be Chinese.
How does he identify people as Chinese? "Bad driving", in one instance.
He also clearly bemoans the presence of Chinese people in the game, and expresses desire that they be removed.
But nah, "he was speaking Doc-anese". You fell for an excuse a six-year-old would come up with, dude.
I'm unfamiliar with how often and when he does the accent, my point was that I do not believe just the accent, in and of itself, is racist.
As far as him wanting to have Chinese people removed from the game, well he pretty much says that to everyone.