hi there. I am sorry about that player, they must have a tough and empty life. Here are some tips you can follow.
http://support.chess.com/Knowledgebase/Article/View/122/0/what-should-i-do-when-another-member-makes-rude-or-abusive-comments-towards-me
please just don't think about stopping playing chess because there are some morons. They are everywhere and chess is such a beautiful game.
I am just playing a tournament here on chess.com and I was surprise that i will battle a player who has a rating of 1500+(note my rating is 1200+) but of course I just think that is only just a challenge on me but after a while he told me that im an imbicile and it hurt my feelings! I wanna say bad words about him but as a catholic I did not I just ignored him. Then I lose. After that I just want to say congrats but he spam me with words like this
He even called me an idiot! I want to report him but I dont know so instead I just post it here, hoping that chess.com facilities will see this.