I agree Raman comes with lots of "baggage" - divorced Ex and kids from his Ex.
But this was a choice that Ishita took while marrying him for whatever reasons.
While Ishita has accepted Ruhi as her own coz that came natural to both Ishita n Ruhi, Ishita took time to understand accept Raman as a love of her life.
But say if I was in place of Ishita n saw my husband not caring about getting his ex home or attending her wedding - I too would not care about it.
So whatever Ishita does is her choice she is not forced by Raman to worry about Adi or Shagun.
She worries about Adi as an individual is great n really applauseworthy coz she is trying to reason out n be cordial with a kid who just hates her. Its difficult being in Ishita's shoes considering Raman's past n interference of Raman's past in their life.
If I remember correctly - this was the same reason Raman wanted to divorce Ishita coz he was tired of His past affecting Ishita all the time (amma accident, molestation by Ex's bf, hand burning etc). He wanted Ishita away from his life so that his past wont affect her in future.
But Ishita chased him to airport got him back n assured that his problems r her problems too. So again dealing with his past is her choice.
Now coming to point of Raman shouting on Ishita n being thankless about it - Ishita needs to voice out n say U r not dealing with ur past, u keep ur ex under same roof, Y r u blaming me? R women weak that they cant open their mouths to husband's ungrateful words? If serial shows this I just dont blame Raman both Ishra r equally at fault. N in reality they r to get Shagun home n dance according to her wishes to appease Adi. Both Ishra r adults.