I joked about his size and he got angry and then insulted my breast size was he serious or just upset?

Anonymous
My boyfriend and I had freinds over and the convo went on to how im in a longer relationships then usual then in the past. I played it off and my boyfriend goes its because he's awesome. I said jokingly nah im surprised too because he's got a small *pointed to my pinki finger*(implying small penis). He looked at me and said well im not a bitch like you I dont go telling people that your flat chested.
He got up and left. It was spurred on by people laughing making it seem worse. I feel like his insult was worse because I meant mine as a joke and his seemed to come up with hidden truth. This makes me feel even worse because he's obsessed with my ass always telling me to wear yoga pants. But he doesn't even glance at my chest.
Are guys that sensitive about there wiener. It's odd he got upset because he actually is well endowed.
He did call me a bitch which hurt me. I dont know whose wrong me or him. How can we fix this?
I joked about his size and he got angry and then insulted my breast size was he serious or just upset?
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