My boyfriend tried to slap my friends butt?

So we had a baby 4 months ago and last night after we put the baby to bed we had a couple friends over and had a few drinks which we use to do alot before I got pregnant. But this was the first time in a long time. And an hour or 2 into hanging out we were playing a game and my friend walked by my boyfriend and he tried to slapped her butt. We all just kinda stopped for a sec and it didn't seem to register with him that he messed up, he was pretty drunk but I wasn't really at all. And later he ended up throwing up and passing out in the bathroom floor. So he is still sleeping this morning how do I confront him about what he did? It's just really embarrassing and upsetting that he would do something like that.