Well, then lets here the real story behind her comment. To me, any woman that uses the "small dick" comment is not worth the time of day. Its rude, uncalled for and belittling to say the least.
The real story is that we had sex for over eight hours until I couldn't get erect and then she said my pene was chiquita. Personally, I'm not troubled with my situation. We are only dating and to me she is one of the most attractive women I've met - She can tease me about my dick as long as she spends more time worshiping it. Maybe she's a size queen, maybe her partners have been packing more than average, maybe she's into humiliation play, maybe she was being sarcastic, maybe she was insecure about something, maybe she watches a lot of porn, maybe she's trying to make me feel insecure, maybe she's seeing if I get angry or act irrational, maybe she wants to sabotage any future relationship...
Looks like most people have said it's a deal breaker and that they'd cut things off promptly if a woman made disparaging penis comments. As long as it's not mean spirited or too often then I don't mind some teasing banter. Which is really the opposite mentality for me prior to PE. I would have taken innocent remarks as insults targeting my junk.
Now though, I laugh it off and then frame/context it to see if it was mean spirited, really bothers me, not a big issue, or perhaps something I'm being insecure about.