I have a good friend who has recently lost the ability to take advice or criticism and has become extremely delusional as a result. It's clear that he has a mental disability of some description and although we (me and other close friends) have tried to accommodate him and give him the support he needs, he has started doing things that are detrimental to his social image and is convinced that anyone that says anything negative about him is "just a hater" or "doesn't know what they're talking about".
He does not have good family support, so trying to go to a family member of his will not work in this situation. He is not getting help from anybody else and if he is left to his own devices he will probably end up in jail or addicted to drugs.
To put into perspective some of his delusions, he is convinced he is a rap god and will become the new Eminem and at one stage he believed he had superpowers. When he said he had superpowers he literally disappeared for 6 months when we said we don't believe him, abandoned all his old friends (including me), and then went homeless for a short while. I kind of lost touch with him before that situation (as he didn't actually tell me he had superpowers, but other people in our friend group) and I only recently got back in contact with him after he moved home.
The guy has a heart of gold and would never hurt anyone, and he was pretty normal up until about 4 years ago. He used to be quite extroverted but in the last year he has been spending a lot of time alone, and is quite shy in most situations now. He was diagnosed with "ADHD" a few years ago, but there were a few inconsistencies in his story when he told me this. I think he may have been diagnosed with something else and told us that it was ADHD. But that's just a hunch and I don't have any way of backing it up.
How can I tell him he needs to get professional help, without making him think that I'm "one of the haters"?