It is due to the fact that this is a unified world where the concept of being different doesn't exist because we're all equal. Recognizing ethnic differences is a sin. Wouldn't want to offend anybody!
Jokes aside, there is no reason. People on websites of all kinds get downvoted for seemingly legitimate content.
Haha I don't really care I think it's cool how people from china train hard at something they are passionate about. Sorry anybody was offended from my comment it was in no way shape or form to come across racist just a guy would practices freedom of speech through the web. Hahaha