Teja was rude to the host because he was talking to umar and she should not have interrupted.
Shamita was not directly rude to the host but yes if it was someone else at her place he or she would have gotten good dose from selmon bhai.
Also somewhere it looked like Salman feels guilty he is favouring Shamita that's why he told Tejaswi..u think I'm favoring her and want umar to choose u.
Because of Salman's connection with Shilpa Shetty he is unable to reprimand Shamita which he was never able to do to tansisha as well. And kushal pointed it out.