To report, type support in the search bar of chess.com
You should be able to find a message like: What if someone is abusing me?
A Friendly Competition
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...Well, I don't know how to report people...but I don't think we should let this guy in the clubhouse anymore...(I left the game comments around when they were sent).
EDIT: I don't think I need to report him. Seems chess.com automatically closed the account.