Who says you can't report people? Not picking on you specifically, but there is a whole world of information available in the Help & Support section (down by the green pawn) that folks just don't seem to be aware of. Don't be afraid to go around the site and click on stuff. You won't break anything. Anyway here's an article that specifically asks you to report them. Screen shots help...
https://support.chess.com/customer/portal/articles/1444785

I was recently playing against user [username removed; send ticket to support as per the link below - mod]. He exhibits the typical vulgar and bullying behavior that often deters me from playing on this site (as you cannot report people for use of inappropriate language). What can you do in a situation like? Is there a way to report such a player who simply logs on to troll other players and say the worst things he can think of?