Lovely take, Sadiie.
It's like, whatever is right for him MUST Be right for everyone else and thus he thinks it's alright to bash his Bahu because he thinks she's wrong. Gah I don't make any sense!
-- You make enough sense. SP is one of those people who really loves you but with their terms & conditions. Its like until you keep satisfying those t&c, you are good and when the moment of your failure comes, your one bad action overrides all your previous good deeds.
My favorite moments are Aarthi blasting Prashant, Ansh running to Yash and Yash's menacing glare at Prashant. But Prashant will not learn his lesson soon. He will surely get hit by Yash (there is an article too confirming that) and audience is also waiting for such a scene.
Vidhi had a cocooned life till now so she might not understand Aarthi's hurdles as an orphan and pain after a failed marriage. For her, it may take time to understand the latter. As you said, she could not even understand the friendship between Aarthi and Aman. So she might be confused how Aarthi could move on when her first spouse is still alive. As per the scene, its more like if Aarthi had really thought of her as elder sister how could Aarthi lie (on such a sensitive matter) to her.