I don't think the writers are trying to whitewash Aastha here. If anything, they have botched up Aastha and Shaan's characters quite a bit compared to Mohor. They were never perfect or ideal characters but they were more real than the black and white characters we are used to seeing on tv. In Mohor, Aditi ( Aastha ) understood Shankho. She never accused him of being arrogant or expected him to be respectful towards her just because she was his mother. In fact she defended him in front of Mohor as well as Adi ( Shaan). Also, as I have said in another post, Adi was also not shown as an irresponsible and absentee father. He was a bit of a misogynist in the beginning but not a wimp. I don't know why they have turned him into a Devdaas here. I had expected DJs to do a better job than Leena G ( for the uninitiated she is the original creator of anupama, imlie, ghkkpm and saakk). I admit Shaurya and Anokhi are much better than Shankho and Mohor but I want to see better characterization for supporting cast too.
I too don't want Shaurya to forgive his parents overnight because his mother is injured. Neither do I say that he should apologize to them for his behaviour. In fact I am enjoying his outbursts. But I am just a viewer. Since everyone understands why Shaurya behaves the way he does, I am trying to figure out why Aastha and Shaan acted the way they did. As a viewer I don't want to make sweeping judgements regarding Aastha or Shaan. At the end of the day it is for the writers to decide how they want to take the story forward. It is at an interesting juncture right now.