A desire to control/manipulate other people is a common character trait, regardless of alcoholism/addiction issues.
If listening to dad go off makes you uncomfortable, you can let him know you will not particippate in further convos on the topic of your mother. If he persists, take responsibility for your own boundary and gently remove yourself from the situation.
A boundary does not seek to control your dad. He's free to find someone else to complain to about the mother of his children.