Not watching BB, but from all that I am reading and a few random clips i watched, Sana hates to be called jealous and now that BB knows that's her weak point, BB goes out of their way to make her think that's exactly how she's perceived by the HMs and people outside too.
This is sadistic poking by BB and the irony was Asim was reprimanded for supposedly poking Sid, who doesn't even need any excuse to get triggered and aggressive.
Anyways I have always said that BB is a game of triggering and how one reacts to it. Even the tasks in BB are solely for this purpose. One should never reveal one's weakness and here Sana is screaming out her weakness n now BB is using that against her. Also if you have shown your weakness and know it's bound to be exploited, then you need to be smart enough to dodge such situations and that is y i found shukla weak, if it wasn't deliberate from his side, when he reacted so violently always.