Since I am not an alcoholic, I really can't say. But for my stepson, I think his verbal attacks were more about how awful HE felt about himself and so he just had to take it out on someone. The nearest someone just happened to be his family. Also, if he could get someone, anyone, to respond and argue in return, it would give his alcoholic brain a reason to drink "They are all so mean to me, I deserve to get drunk". Of course, this totally disregards the fact that HE started the arguments, he pushed and prodded and poked until someone responded. That is all conveniently forgotten by the disease.
I'm sorry that you are going through this! Just remember, you don't have to stay 'on the playground'. You can disengage, not answer his calls, end the conversation as soon as you see where it is headed. It is our own Ego and need to argue and tell someone they are wrong that keeps us engaged in these battles. Once we give up that need, then peace will follow!
Hang in there!