Shiv is truly a classless and mannerless guy who doesn't know how to respect boundaries.
Calling Tina "dear" even after being told that she's uncomfortable with him calling her that, he continued using that word only to mock and provoke her. Even made fun of her birthday.
Aur jab Tina maa-behen par gayi toh bechare ki sulag gayi. He should know when you don't know how to respect women, people are going to assume things about your mother and sister.