Why they have to show Kastur superior always, they could have ended with both having same points but no they have to show Kastur's dominance over Mohan.
Being a girl, I certainly respects what they are trying to show in reference of women work for their household but this doesn't mean that men never do anything and its just women who manages all. If a women manages home then men also go outside to earn for their family and all those women who works outside will also agree that without the cooperation of their family members they could not play both parts equally well
I know it was a cute part of the function and they could have ended it cutely as well, always showing girl's superiority over boys is something which can irritate any girl as well and its not coz HC is Mohan.