DD and her friend were in a café today and on a table by them were a couple of young boys with their mums. While the mums were up at the counter ordering the boys were talking and conversation turned to "why do those girls have big boobs?" to which the other boy answered "so when they're older they can marry billionaires". They thought they were doing it quietly but in that way kids sometimes do, weren't. DD and her friend thought this was all very funny and told the story in a this was hilarious sort of way when they got back but part of me thinks I should say something to DD saying it wasn't really or AIBU?