Sheetal because of Arnav. It's because of HIS attitude that we all hate her. If he was not so attentive to her, we would not be bothered. But here he is, a married man, who purports to love his wife more than life itself, yet he can't stand to be with her. Even when he came back from the BB game, and
finally asked about her - hours after- like he suddenly remembered, he hardly glanced at her, returning his attention back to Sheetal and Aarav, playing nice for them. (btw at the game he didn't even miss her, even after he won, he didn't even look for her!)
Obviously, we all know that is not ASR. (We all but the CVs!!!) ASR would never ever treat Kushi the way lover boy is.(CVs killed him today when he hardly bothered about her when she fell, wasn't at all concerned, did not even ask, look!) And that is why we hate Sheetal because Arnav is all lovey-dovey with her, whilst ignoring, getting irritated, insulting, ridiculing Kushi.