i 'suffered' from this condition for many years, decades, almost. i came to believe that it is a brain chemistry disorder, and is as difficult to 'control' as any other mood disorder,, like an OCD.

what eventually helped me was the Binaural Beats, which helped my brain to rebalance itself. this is often NOT a conduct disorder, which may be helped with cognitive therapy, or other non-interventions. i did respond to personal 'coaching', where someone who knew how could get my attention, and instruct me how to move out of that state.

i hope you don't take what happens personally, and do not desert your friend just because he suffers so terribly when experiencing frustration.