Dadaji might be doing this for a good cause and might have Kunal's best wishes in mind...
But I would say that this is real hard lesson to learn - and in the worst way possible...
I can't imagine how it will affect me (mentally, emotionally) - if my family was to one fine day disown me completely...
To deny Kunal even things like food, entertainment, etc... And to top it all - have a party & celebration to declare to the world that he is no more part of ur family - why did dadaji do that??? why not a press conference?
And that too – all these coming from the person whom he loved and respected the most – and looked up to…
We all know that Kunal is the hero in this serial and so nothing bad will happen to him and at the end he will come out of it all victorious! – that "all is well that ends well". And since we have this strong belief that it is all for Kunal's good, we wouldn't really mind seeing all this happening to him…
But, what if it didn't happen so? He is giving Kunal the shock of his life!!! What if Kunal crumbled upon this? (he couldn't take it initially and was down completely – till he was helped by Nimmo/KB).
He was the most pampered and favored grand son so far… Think dadaji can only think in extremes – best or worst - nothing in between – for both his sons and grandsons – either give everything or nothing!! Why is Aniket and Samar so much against Kunal ? Because till now he had everything and they, nothing !! How can you treat your own kids so differently?
What i feel is that dadaji's goal is right, but the method is not - he is over doing it !!