best friend drunkenly slaps me in front of new girlfriend...

[Eegs]

Monday night I went out to meet a couple friends for some drinks at random club. I brought my new girlfriend to meet them(we've been together about a month so we're still pretty new). We get there first, I buy a couple beers and we sit and wait for my friends to arrive. They show up, one is obviously pretty [censored] up and I introduce them to my girl. A couple moments later my buddy full-force slaps Rick James style me across the face because he's an idiot and I am speechless. What was the proper course of action now that my new GF thinks I'm a punk beeeyatch.