Sooo pissed! I need advice!

First of all, my boyfriend and I been together for a year and we love each very much. Okay last night my boyfriend and I were watching a tv show at my house and there was a sex scene at a point. Anyway during the scene, the focus was on the girl (doing the sexual acts) anyway my boyfriend says out "look at that dirty bitch" Like omg what is his point?! Anyway he thinks I didn't hear it the first time then he says it again. Then I asked what did he say then he said oh you didn't listen. Then I said "oh you said look at that dirty bitch, why would you say that" then he said I'm just trying to stir you up. Then I felt offended, like many things came to my mind. am I overthinking? Anyway I felt weird and he asked if I was okay. I said yeah then I said that he better go soon and that I just need a good night sleep. Anyway then the night ended.... 
So am I overthinking? I just was offended and started to overthink about everything.