People abandoning games has nothing to do with their race. There are sore losers in every race you can think of.
You can report a user for stalling/quitting and appropriate actions will be taken.
https://support.chess.com/article/209-how-do-i-report-someone
Why do so many [Removed: Staerex] abandon a game as soon as they are about to lose. Playing this guy, higher rating than me. As soon as it looked like I was about to win I sent him a GG. The moment it was inevitable he would lose he blocked chat and abandoned the board. Why can't .Com punish these people. It is such a frequent act. More importantly, why can't they lose with grace. We the British taught them all they know about civilised behaviour honour and manners. You would have thought some of it might have stuck by now. No, this is not racist, unless telling the truth has now become racist. God save the King.