Lurkette gives some good advice in this thread.
He needs encouragement from you. Telling a person that they're bad at something has never improved their performance, but telling a person you see potential for improvement and think they can do it can work wonders. He's not an easy case obviously. But take a step back from the situation and before doing something you think will try to help him think about the consequences of what you say.
For example, if you tell someone not to do something that makes them want to do it more. But if you tell someone to do something, that makes them want to do what you want them to do.
Hopefully that makes some sense
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