what is he suppoe to do????after seeing what manthan does!!!
also,i tink tanya hasn't been able to keep her kids in-check and has taken every step to spoil them!!!
Also i think karan has become very arrogant and tough from within...
His bad behaviour i think its due to his fustrations and pain of losing his two most important people in his life,
1.tulsi,2.nandini and also his in-ability of stopping meera to come in SN,unable to stop ganga from laving the house....
So,i think its a mixture of all these!!