And most importantly how you haven't jumped off the nearest building to make it stop???
there is any easier less destructive way to make it stop. you can't talk reason to crazy. you can't get an alcohol saturated brain to connect the dots. your first step is to stop attempting to talk sense to HIM. talk sense to YOURSELF. do not engage. do not give him your ear when he is on a rant. spend as much time OUT Of his company as possible.
and then ask yourself...why is staying even an option for me? what am I getting out of staying in this madness?