Karishma:
The Saturday and Sunday show are taped on the same day. Yesterday's episode had Salman grilling Karishma on her captaincy, math, etc. Today's episode had teasing on Pritam. Plus, Puneet's comments when Sonam was at the house. I can imagine listening to all this criticism in 1 day was too much and she broke.
On the other hand, she shouldn't have said "That isn't funny." It broke the lightheartedness of the moment.
Salman:
I don't think he was trying to be malicious. And when Karishma started to cry, he probably freaked because it makes him look bad.
But I also think he shouldn't have implied that she was "fake crying." I do think she genuinely was overwhelmed with emotion. And he took the teasing too far. 1 or 2 times is enough but he said it quite a bit.