I'm really sorry to see you and your child are going through so difficult time and that your ex is behaving like an idiot. I understand that you are trying to arrange what is best for your child, and that your ex doesn't seem as bothered as you are about your child's welfare.
Court can make the things easier but also more difficult. But there is something to consider, courts can set a contact pattern in stone, but they cannot enforce it. Sure if one claims that the other parent is obstructing contact, they will do something about it, but if a parent has lost interest, there's absolutely nothing they can do to force the parent to see the child.
So, I would say that it is not your child who should think whether he wants to continue to have contact with his dad (he is far too young to carry the responsibility of such decision), but you.
I see your ex is acting as an arse, and you can only co parent a child effectively together if you can communicate with each other, so the question is, could you meet him half way with his requests? If so, it may be that you can get to an agreement, otherwise it seems to me that he may join the thousands of non resident parents who do not want contact with their children (having said that, loosing contact with a terrible parent is not necessarily a bad thing, so ponder about this but keep putting the interests of your child first)
I really do think that you shouldn't agree about any contact pattern until he agrees to communicate with you. It doesn't have to be verbal, an email, or even a notebook where you can note any information about the child (like he has ab party next saturday or he had a dose of calpol at 4) it is essential to avoid turning the child into messenger, a role you need to avoid as this is more damaging than going no contact.
The court process won't be easy and would be painful for all sides involved, but there are a few questions that I wish I had asked myself with more honesty when things starting to go so pear shaped with DS and his dad: am I facilitating contact with such abusive man because society believes that's the way forward? Do I believe that the current level and quality of contact is benefitting my child? And most importantly, am I bending myself backwards to facilitate contact even when it is not good for DS because I am still afraid of my ex or what the court would say if I don't allow contact?