He is just acting like a victim, that people in this forum are just haters that are not strong enough to be a jw help byb Jehovah.
He has been brainwashed to think that way. I once thought that way, we all probably did. The cult brainwashed us to see anyone that walked away from the cult as "mentally diseased apostates". Those were their actual words. By labeling us as such they preemptively discredit anything we say without having to think about anything or learn anything new. They can just sit in their comfortable brainwashing without ever making any changes.
By the way, if he wants to compare credentials within the cult that he was kicked out of by disfellowshipping I'll put mine up against his. Many here were elders, ministerial servants, pioneers, etc. And if Jehovah couldn't help us be faithful servants, then how weak must Jehovah be? His arguments are weak and his controlling nature is strong.
Jehovah's Witnesses shun people and then blame them for being shunned. JWs ALWAYS play the victim, they have been taught to. They are the victims of this evil world as they see it. Any questioning of them is seen as "persecution", yet they try to push people to question their beliefs so as to become JWs. Their organization is toxic and very sick and you should stay far away or they can make you toxic and sick too. You're seeing some of the symptoms in dealing with this man.
You are right, it is very sad. I'm truly sorry for your loss, and I know it hurts, but it is for the best. You are dodging a bullet here.