I use to love InstantChess until they went to the subscription model. But I have witnessed chats like the one you posted on InstantChess as well, just not quite as often!
Just played on instantchess.com
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Just played on instantchess.com. It was such a pleasant experience. No abuse on chat. No rude messages or comments after the game. No insulting messages posted on profile page. No need to "disable" chat. No need to block any lunatics.
While, here, on this site, this is what I got from a guy on chat: