It's possible that alcohol "turned him this way." It's also possible that he was an abusive jerk before and just covered it up better. Who knows? I think a lot of times alcohol gets too much credit/blame for bad behavior. There are plenty of alcoholics who aren't misogynists, and plenty of abusive jerks who don't drink. I don't think there is a cause/effect connection to be made here.
All that matters is whether his behavior is acceptable to you. What if he stopped drinking and still behaved the same?
L