I understood it such that he argued for legal young girls and the picture was only there as a sort of provocation to generate more responses, in which he succeeded?
I think that's the main predicament of a male when searching for a female partner. Because she is most attractive physically when she is 20, but almost everbody is an idiot at least until 30, you mostly can't have a partner both with a good personality and physically very attractive.
What you talk about with them also depends on age. The younger they are the more you need to choose entertaining and flashy topics. Once they're 30+ they're happy anybody talks with them, doesn't matter so much the topic. Overall what you say is mostly not that important compared to how you say it and how she sees you. Women are the instigators of a prevalent fixation on social status.