Communication issues for a while - toddlers have made life a bit chaotic and DP 'can't cope'. Fine, we've discussed this and he's unhappy and tired and stressed at work. Won't do anything about it though so we muddle on.
Last night we had a bit of a falling out and he stormed off to bed. We had a brief discussion about it this morning and agreed to move on.
Now to this afternoon, out with his friends and we start talking to a women who was part of the group who we'd never met, all fine, conversation turned to the Internet and dodgy sites and he starts talking about an inappropriate one with men masturbating. I was a bit 
anyway the woman and him seemed quite ok with it and they at this point decided to include me in the conversation at this point to ask if I'd heard of it (the site they were on about). No I hadn't so after we left I said to him that made me feel very awkward as I really don't want to be next to you while you're going on about that sort of thing to a woman we don't know.
He exploded at this point and told me I'm not his mother and I make him feel uncomfortable and he wants to spend the afternoon alone.
He's now gone off to do something and I'm at home crying because I feel like I'm a prude and being over the top for thinking it's weird him to be going on about men masturbating in whatever context to some random woman and in front of me.
Is it me?