How would you react if your husband spanked you out of anger?

My husband and I were planning on going to a friend's house for dinner yesterday. Before going he asked if we don't stay long...till 11:pm tops because he had a meeting really early in the morning the next day. I said, "yes"....but once we were there the drinking began and to be honest...maybe I was acting a little self fish but I didn't want to go home. He threatened to leave without me and went outside into the car and waited for me for two hours, then came back in and started screaming. Then I finally gave in..he seemed to cool off, but once we said, "bye" to the friend and we closed the door, he slapped me hard on my butt without saying anything...(it was not a s.exy kind of slap..I didn't misinterapt anything) I got mad again and walked back to my friends house. This was an on going battle till 3 am in the morning. Now I am not speaking to him for the slap and he's trying to get on my good side. Should I give him the cold shoulder for another couple of days? He's 49, he should know better. I'm 37 btw.