Yes, at first I did think that Ishan's response was natural, he would think like that at first. After all, how much does he know about Mahi anyway?
But as the episode progressed and especially towards the end I am quite sure that it wasn't so much about discussing your personal life as it was everyone knowing that it's Mahi actually.
The logic about being from a conservative family and all just didn't click. Isn't he just so famous for changing his girlfriends like T-shirts? When everyone else knows that, how does the news escape his family???
And from the precap, he seems very much the type use, abuse, and trash. Unfortunately the victim this time was Mahi.