Krishna will obviously grow in both his understanding of social values and his own personality and agree that he doesn't need to prove it to any one but himself first, not even to Pratigya as a matter of fact. He is too good and too intelligent for his own comfort, he learns quickly, he clearly sees black form white. But he knows his short comings too, he gets frustrated seeing wrongs happenings within his family, and his love for his family prohibits him from going all the way, and taking lead in correcting the wrongs. Reasons- lack of education, and his hard realization of the fact that it is a short coming which frustrate him often,
He taunts Pratigya often because she is educated but knows in his heart that that she is often right too and that is the reason why he takes her side against his own family. He clearly sees a difference there.
Aman is mentioned here by Bubble merely to home in the point that now Krishna's SIL is getting married to an educated person and that person will always be interacting with him because he will become his BIL and a constant irritant for Krishna ( regardless of the fact that Aman could be a very Grey character as we the viewers can see him but not Krishna at this point).
Krishna will feel his shortcoming often and would constantly behave in the ways he had behaved from the very first interaction with Aman when he fought him over a jug of water. What an impression he left than and all the subsequent incidents with him, he is continuing the same ways when the two faces each other.
Do we want to see Krishna looks like a fool in front of Aman, hell no. We want to see him as a better person then Aman, and only when he himself could express it with a broad smile and his witty one liners that even Aman couldn't answer with all his education and lawyergiri.!!