I cannot but laugh at that but I think the writer of the message is trying to be really flexible and not take so serious as a professional would have done. I really don't think its a racist comment but rather a form of informal and trying to familiarize with their client since their services is more of a peer to peer platform and not a centralized one where you have in the case of Bitrexx of Poloniex. And if you really read what is being propagated there, it goes both ways and even a form of explanation so you think you are chatting with a white guy which might turn out to be your neighbor. The best is stick to the rules of the game if you don't want to get bitten.