Actually Ishan did make fun of Suhana and teased her after she made rotis for the first time. At first suhana threw a pillow at him and then she was about to pick up a flower vase, but when Ishan smiled at her, she put down the vase and she smiled too. As far as I remember, she didn't bash him for making fun of her, because she knew Ishan was just teasing her. He even made fun of suhana at the picnic when Meena was trying to copy her, and despite that Suhana never bashed him or yelled at him.Brothers made fun is affection as they do share such relation but suhana ishaan have no such relationship . ishaan can not make fun of suhana if he do so she would give him bashing on his face that how dare he but if suhana makes fun of him or ignores him, its ok. she is too egoistic where as inder ilesh would not mind if ishaan make fun of them