Ugh, it's the worst when you see a thing like that, poor little boy. I actually recall a similar instance when my own daughter was young where she was the one to loudly (though I don't think the loudly was intended for the woman, but only to be heard over the woman's shrieking) proclaim "I'm glad she's not my mommy!" I felt both pity for the child being shouted at and secretly happy that my daughter got to see how lucky she is, hahaha!
Hehe, I do love the random things or not so radom that they come out with. They have a habit of just saying the truth very loudly! Everytime my daughter does I think, aah thats my girl!! :OD