https://support.chess.com/customer/en/portal/articles/1444785-my-opponent-said-some-very-abusive-and-rude-things-what-should-i-do-
Please don't recreate rude posts in the forums. You can block the member and if they are really bad, report them directly. Take a screenshot to provide to support when asked.
Is there a way to report someone who can't handle losing? I beat a guy and he said [removed -- VP] and "do you want a rematch, [removed -- VP]?" I am neither of those, but I find that offensive and there should be no place for people like that on chess.com.