"Good for Africans and Russians" means "bad for students" because you're selling them a highly non-standard form of English, spoken by people whom native speakers can't understand well. It doesn't mean that you aren't racist. Good luck finding a non-racist Chinese person. You still don't give a shit about any laowai beyond cashing them in, same as your competitors. I'm no fan of the "any white face" policy, but "any warm body from abroad" is even shittier and greedier.

Also, your Chinglish should remind you why you pay us. You'll never pass as us.