You are doing great and making excellent choices.
He's the one with the questionable judgement--choosing to drink despite everything.
Sounds like classic displacement to me.
I'm sorry about the job issue but it sounds like you've resolved it quickly and that's very impressive.
It will get better and better as you gain more distance from him and perspective.
Insults shouldn't be part of the "exchange" process with child. Perhaps you can
calmly state he stay on topic if that starts again, and keep judgements to himself?
You no longer have to live with it, and isn't that a wonderful thing?