If it isn't normal for you and him and it has upset you, then I think it is as simple as trying to keep yourself as calm as you can. Give him a bit of time to recover (if he has liver problems, he will feel rotten).
At a time when you are both calm, explain to him that you were worried and felt as of he acted in a way that was out of character. Ask him what happened.
Try to find out if this is something he did in reaction to something in your relationship or whether something just came up, and he misjudged how it would make you feel and then had his thinking skewed by alcohol.
I think how you handle this could be very important in how your relationship goes forward.
If he's generally a kind person, and you outline how it made you feel, then he will hopefully take that on board and try not to do it again.
If he's actually not so kind and despite your explanation, he starts to do this regularly, then you are seeing the real him and (sadly) he might not be the one for you.
If you fail to calm yourself and use anger and guilt to try and control his future behaviour, there's a risk he will comply unwillingly for now, but resentment will begin to build.
Try not to let your past relationship experiences impact this one. This is not your ex. This is your boyfriend who may have made a thoughtless mistake because he didn't fully appreciate how it would affect you. I'm not sure how long you've been together, but if up until now there have been no red flags, then try to give him the benefit of the doubt. How things progress will then allow you to judge. Everyone makes mistakes now and then.
Good luck.