You can block him.
Rude Player
Publicly naming and shaming is not allowed. Why not take your grievance through the Help > Report abuse channel.
If you need help, please contact our Help and Support team.
Publicly naming and shaming is not allowed. Why not take your grievance through the Help > Report abuse channel.
If you need help, please contact our Help and Support team.
A player [player name removed] had rudely called me an idiot at the end of the game as he already about to checkmate me. Please deal with that bigshot. Thank you.
[Please don't accuse other members in the public forums - see https://support.chess.com/customer/en/portal/articles/1444877-what-should-i-do-if-another-member-is-rude-or-abusive for some of the tools Chess.com provides for people to help manage this type of behaviour; that FAQ also gives instructions on how you can report particularly egregious behaviour. Thanks - David, moderator]